/*****************************************************************************

Copyright (c) 2008, 2021, Oracle and/or its affiliates.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.

This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation.  The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License, version 2.0, for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA

*****************************************************************************/

/**************************************************//**
@file api/api0api.cc
InnoDB Native API

2008-08-01 Created Sunny Bains
3/20/2011 Jimmy Yang extracted from Embedded InnoDB
*******************************************************/

#include "ha_prototypes.h"

#include "api0api.h"
#include "api0misc.h"
#include "srv0start.h"
#include "dict0dict.h"
#include "btr0pcur.h"
#include "row0ins.h"
#include "row0upd.h"
#include "row0vers.h"
#include "trx0roll.h"
#include "dict0crea.h"
#include "row0merge.h"
#include "pars0pars.h"
#include "lock0types.h"
#include "row0sel.h"
#include "lock0lock.h"
#include "rem0cmp.h"
#include "dict0priv.h"
#include "trx0roll.h"
#include "row0trunc.h"

/** configure variable for binlog option with InnoDB APIs */
my_bool ib_binlog_enabled = FALSE;

/** configure variable for MDL option with InnoDB APIs */
my_bool ib_mdl_enabled = FALSE;

/** configure variable for disable rowlock with InnoDB APIs */
my_bool ib_disable_row_lock = FALSE;

/** configure variable for Transaction isolation levels */
ulong ib_trx_level_setting = IB_TRX_READ_UNCOMMITTED;

/** configure variable for background commit interval in seconds */
ulong ib_bk_commit_interval = 0;

/** InnoDB tuple types. */
enum ib_tuple_type_t{
	TPL_TYPE_ROW,			/*!< Data row tuple */
	TPL_TYPE_KEY			/*!< Index key tuple */
};

/** Query types supported. */
enum ib_qry_type_t{
	QRY_NON,			/*!< None/Sentinel */
	QRY_INS,			/*!< Insert operation */
	QRY_UPD,			/*!< Update operation */
	QRY_SEL				/*!< Select operation */
};

/** Query graph types. */
struct ib_qry_grph_t {
	que_fork_t*	ins;		/*!< Innobase SQL query graph used
					in inserts */
	que_fork_t*	upd;		/*!< Innobase SQL query graph used
					in updates or deletes */
	que_fork_t*	sel;		/*!< dummy query graph used in
					selects */
};

/** Query node types. */
struct ib_qry_node_t {
	ins_node_t*	ins;		/*!< Innobase SQL insert node
					used to perform inserts to the table */
	upd_node_t*	upd;		/*!< Innobase SQL update node
					used to perform updates and deletes */
	sel_node_t*	sel;		/*!< Innobase SQL select node
					used to perform selects on the table */
};

/** Query processing fields. */
struct ib_qry_proc_t {

	ib_qry_node_t	node;		/*!< Query node*/

	ib_qry_grph_t	grph;		/*!< Query graph */
};

/** Cursor instance for traversing tables/indexes. This will eventually
become row_prebuilt_t. */
struct ib_cursor_t {
	mem_heap_t*	heap;		/*!< Instance heap */

	mem_heap_t*	query_heap;	/*!< Heap to use for query graphs */

	ib_qry_proc_t	q_proc;		/*!< Query processing info */

	ib_match_mode_t	match_mode;	/*!< ib_cursor_moveto match mode */

	row_prebuilt_t*	prebuilt;	/*!< For reading rows */

	bool		valid_trx;	/*!< Valid transaction attached */
};

/** InnoDB table columns used during table and index schema creation. */
struct ib_col_t {
	const char*	name;		/*!< Name of column */

	ib_col_type_t	ib_col_type;	/*!< Main type of the column */

	ulint		len;		/*!< Length of the column */

	ib_col_attr_t	ib_col_attr;	/*!< Column attributes */

};

/** InnoDB index columns used during index and index schema creation. */
struct ib_key_col_t {
	const char*	name;		/*!< Name of column */

	ulint		prefix_len;	/*!< Column index prefix len or 0 */
};

struct ib_table_def_t;

/** InnoDB index schema used during index creation */
struct ib_index_def_t {
	mem_heap_t*	heap;		/*!< Heap used to build this and all
					its columns in the list */

	const char*	name;		/*!< Index name */

	dict_table_t*	table;		/*!< Parent InnoDB table */

	ib_table_def_t*	schema;		/*!< Parent table schema that owns
					this instance */

	ibool		clustered;	/*!< True if clustered index */

	ibool		unique;		/*!< True if unique index */

	ib_vector_t*	cols;		/*!< Vector of columns */

	trx_t*		usr_trx;	/*!< User transacton covering the
					DDL operations */
};

/** InnoDB table schema used during table creation */
struct ib_table_def_t {
	mem_heap_t*	heap;		/*!< Heap used to build this and all
					its columns in the list */
	const char*	name;		/*!< Table name */

	ib_tbl_fmt_t	ib_tbl_fmt;	/*!< Row format */

	ulint		page_size;	/*!< Page size */

	ib_vector_t*	cols;		/*!< Vector of columns */

	ib_vector_t*	indexes;	/*!< Vector of indexes */

	dict_table_t*	table;		/* Table read from or NULL */
};

/** InnoDB tuple used for key operations. */
struct ib_tuple_t {
	mem_heap_t*		heap;	/*!< Heap used to build
					this and for copying
					the column values. */

	ib_tuple_type_t		type;	/*!< Tuple discriminitor. */

	const dict_index_t*	index;	/*!< Index for tuple can be either
					secondary or cluster index. */

	dtuple_t*		ptr;	/*!< The internal tuple
					instance */
};

/** The following counter is used to convey information to InnoDB
about server activity: in case of normal DML ops it is not
sensible to call srv_active_wake_master_thread after each
operation, we only do it every INNOBASE_WAKE_INTERVAL'th step. */

#define INNOBASE_WAKE_INTERVAL	32

/*****************************************************************//**
Check whether the InnoDB persistent cursor is positioned.
@return IB_TRUE if positioned */
UNIV_INLINE
ib_bool_t
ib_btr_cursor_is_positioned(
/*========================*/
	btr_pcur_t*	pcur)		/*!< in: InnoDB persistent cursor */
{
	return(pcur->old_stored
	       && (pcur->pos_state == BTR_PCUR_IS_POSITIONED
	           || pcur->pos_state == BTR_PCUR_WAS_POSITIONED));
}


/********************************************************************//**
Open a table using the table id, if found then increment table ref count.
@return table instance if found */
static
dict_table_t*
ib_open_table_by_id(
/*================*/
	ib_id_u64_t	tid,		/*!< in: table id to lookup */
	ib_bool_t	locked)		/*!< in: TRUE if own dict mutex */
{
	dict_table_t*	table;
	table_id_t	table_id;

	table_id = tid;

	if (!locked) {
		dict_mutex_enter_for_mysql();
	}

	table = dict_table_open_on_id(table_id, TRUE, DICT_TABLE_OP_NORMAL);

	if (table != NULL && table->ibd_file_missing) {
		table = NULL;
	}

	if (!locked) {
		dict_mutex_exit_for_mysql();
	}

	return(table);
}

/********************************************************************//**
Open a table using the table name, if found then increment table ref count.
@return table instance if found */
static
dict_table_t*
ib_open_table_by_name(
/*==================*/
	const char*	name)		/*!< in: table name to lookup */
{
	dict_table_t*	table;

	table = dict_table_open_on_name(name, FALSE, FALSE,
					DICT_ERR_IGNORE_NONE);

	if (table != NULL && table->ibd_file_missing) {
		table = NULL;
	}

	return(table);
}

/********************************************************************//**
Find table using table name.
@return table instance if found */
static
dict_table_t*
ib_lookup_table_by_name(
/*====================*/
	const char*	name)		/*!< in: table name to lookup */
{
	dict_table_t*	table;

	table = dict_table_get_low(name);

	if (table != NULL && table->ibd_file_missing) {
		table = NULL;
	}

	return(table);
}

/********************************************************************//**
Increments innobase_active_counter and every INNOBASE_WAKE_INTERVALth
time calls srv_active_wake_master_thread. This function should be used
when a single database operation may introduce a small need for
server utility activity, like checkpointing. */
UNIV_INLINE
void
ib_wake_master_thread(void)
/*=======================*/
{
        static ulint    ib_signal_counter = 0;

        ++ib_signal_counter;

        if ((ib_signal_counter % INNOBASE_WAKE_INTERVAL) == 0) {
                srv_active_wake_master_thread();
        }
}

/*****************************************************************//**
Read the columns from a rec into a tuple. */
static
void
ib_read_tuple(
/*==========*/
	const rec_t*	rec,		/*!< in: Record to read */
	ib_bool_t	page_format,	/*!< in: IB_TRUE if compressed format */
	ib_tuple_t*	tuple,		/*!< in: tuple to read into */
	void**		rec_buf,        /*!< in/out: row buffer */
        ulint*          len)            /*!< in/out: buffer len */
{
	ulint		i;
	void*		ptr;
	rec_t*		copy;
	ulint		rec_meta_data;
	ulint		n_index_fields;
	ulint		offsets_[REC_OFFS_NORMAL_SIZE];
	ulint*		offsets	= offsets_;
	dtuple_t*	dtuple = tuple->ptr;
	const dict_index_t* index = tuple->index;
	ulint		offset_size;

	rec_offs_init(offsets_);

	offsets = rec_get_offsets(
		rec, index, offsets, ULINT_UNDEFINED, &tuple->heap);

	rec_meta_data = rec_get_info_bits(rec, page_format);
	dtuple_set_info_bits(dtuple, rec_meta_data);

	offset_size = rec_offs_size(offsets);

	if (rec_buf && *rec_buf) {
		if (*len < offset_size) {
			free(*rec_buf);
			*rec_buf = malloc(offset_size);
			*len = offset_size;
		}
		ptr = *rec_buf;
	} else {
		/* Make a copy of the rec. */
		ptr = mem_heap_alloc(tuple->heap, offset_size);
	}

	copy = rec_copy(ptr, rec, offsets);

	n_index_fields = ut_min(
		rec_offs_n_fields(offsets), dtuple_get_n_fields(dtuple));

	for (i = 0; i < n_index_fields; ++i) {
		ulint		len;
		const byte*	data;
		dfield_t*	dfield;

		if (tuple->type == TPL_TYPE_ROW) {
			const dict_col_t*	col;
			ulint			col_no;
			const dict_field_t*	index_field;

			index_field = dict_index_get_nth_field(index, i);
			col = dict_field_get_col(index_field);
			col_no = dict_col_get_no(col);

			dfield = dtuple_get_nth_field(dtuple, col_no);
		} else {
			dfield = dtuple_get_nth_field(dtuple, i);
		}

		data = rec_get_nth_field(copy, offsets, i, &len);

		/* Fetch and copy any externally stored column. */
		if (rec_offs_nth_extern(offsets, i)) {

			const page_size_t	page_size(
				dict_table_page_size(index->table));

			data = btr_rec_copy_externally_stored_field(
				copy, offsets, page_size, i, &len,
				tuple->heap);

			ut_a(len != UNIV_SQL_NULL);
			/* Reset the data length if it fails to copy
			externally stored column */
			if (data == NULL) {
				/* data == NULL means that the externally
				stored field was not written yet.
				This record should only be seen by
				TRX_ISO_READ_UNCOMMITTED transactions. */
				ut_ad(ib_cfg_trx_level() ==
					IB_TRX_READ_UNCOMMITTED);
				len = 0;
			}
		}

		dfield_set_data(dfield, data, len);
	}
}

/*****************************************************************//**
Create an InnoDB key tuple.
@return tuple instance created, or NULL */
static
ib_tpl_t
ib_key_tuple_new_low(
/*=================*/
	const dict_index_t*	index,	/*!< in: index for which tuple
					required */
	ulint			n_cols,	/*!< in: no. of user defined cols */
	mem_heap_t*		heap)	/*!< in: memory heap */
{
	ib_tuple_t*	tuple;
	ulint		i;
	ulint		n_cmp_cols;

	tuple = static_cast<ib_tuple_t*>(
			mem_heap_alloc(heap, sizeof(*tuple)));

	if (tuple == NULL) {
		mem_heap_free(heap);
		return(NULL);
	}

	tuple->heap  = heap;
	tuple->index = index;
	tuple->type  = TPL_TYPE_KEY;

	/* Is it a generated clustered index ? */
	if (n_cols == 0) {
		++n_cols;
	}

	tuple->ptr = dtuple_create(heap, n_cols);

	/* Copy types and set to SQL_NULL. */
	dict_index_copy_types(tuple->ptr, index, n_cols);

	for (i = 0; i < n_cols; i++) {

		dfield_t*	dfield;

		dfield	= dtuple_get_nth_field(tuple->ptr, i);
		dfield_set_null(dfield);
	}

	n_cmp_cols = dict_index_get_n_ordering_defined_by_user(index);

	dtuple_set_n_fields_cmp(tuple->ptr, n_cmp_cols);

	return((ib_tpl_t) tuple);
}

/*****************************************************************//**
Create an InnoDB key tuple.
@return tuple instance created, or NULL */
static
ib_tpl_t
ib_key_tuple_new(
/*=============*/
	const dict_index_t*	index,	/*!< in: index of tuple */
	ulint			n_cols)	/*!< in: no. of user defined cols */
{
	mem_heap_t*	heap;

	heap = mem_heap_create(64);

	if (heap == NULL) {
		return(NULL);
	}

	return(ib_key_tuple_new_low(index, n_cols, heap));
}

/*****************************************************************//**
Create an InnoDB row tuple.
@return tuple instance, or NULL */
static
ib_tpl_t
ib_row_tuple_new_low(
/*=================*/
	const dict_index_t*	index,	/*!< in: index of tuple */
	ulint			n_cols,	/*!< in: no. of cols in tuple */
	mem_heap_t*		heap)	/*!< in: memory heap */
{
	ib_tuple_t*	tuple;

	tuple = static_cast<ib_tuple_t*>(mem_heap_alloc(heap, sizeof(*tuple)));

	if (tuple == NULL) {
		mem_heap_free(heap);
		return(NULL);
	}

	tuple->heap  = heap;
	tuple->index = index;
	tuple->type  = TPL_TYPE_ROW;

	tuple->ptr = dtuple_create(heap, n_cols);

	/* Copy types and set to SQL_NULL. */
	dict_table_copy_types(tuple->ptr, index->table);

	return((ib_tpl_t) tuple);
}

/*****************************************************************//**
Create an InnoDB row tuple.
@return tuple instance, or NULL */
static
ib_tpl_t
ib_row_tuple_new(
/*=============*/
	const dict_index_t*	index,	/*!< in: index of tuple */
	ulint			n_cols)	/*!< in: no. of cols in tuple */
{
	mem_heap_t*	heap;

	heap = mem_heap_create(64);

	if (heap == NULL) {
		return(NULL);
	}

	return(ib_row_tuple_new_low(index, n_cols, heap));
}

/*****************************************************************//**
Begin a transaction.
@return innobase txn handle */
ib_err_t
ib_trx_start(
/*=========*/
	ib_trx_t	ib_trx,		/*!< in: transaction to restart */
	ib_trx_level_t	ib_trx_level,	/*!< in: trx isolation level */
	ib_bool_t	read_write,	/*!< in: true if read write
					transaction */
	ib_bool_t	auto_commit,	/*!< in: auto commit after each
					single DML */
	void*		thd)		/*!< in: THD */
{
	ib_err_t	err = DB_SUCCESS;
	trx_t*		trx = (trx_t*) ib_trx;

	ut_a(ib_trx_level <= IB_TRX_SERIALIZABLE);

	trx->api_trx = true;
	trx->api_auto_commit = auto_commit;
	trx->read_write = read_write;

	trx_start_if_not_started(trx, read_write);

	trx->isolation_level = ib_trx_level;

	/* FIXME: This is a place holder, we should add an arg that comes
	from the client. */
	trx->mysql_thd = static_cast<THD*>(thd);

	return(err);
}

/*****************************************************************//**
Begin a transaction. This will allocate a new transaction handle.
put the transaction in the active state.
@return innobase txn handle */
ib_trx_t
ib_trx_begin(
/*=========*/
	ib_trx_level_t	ib_trx_level,	/*!< in: trx isolation level */
	ib_bool_t	read_write,     /*!< in: true if read write
					transaction */
	ib_bool_t	auto_commit)	/*!< in: auto commit after each
					single DML */
{
	trx_t*		trx;
	ib_bool_t	started;

	trx = trx_allocate_for_mysql();

	started = ib_trx_start(static_cast<ib_trx_t>(trx), ib_trx_level,
			       read_write, auto_commit, NULL);
	ut_a(started);

	return(static_cast<ib_trx_t>(trx));
}

/*****************************************************************//**
Check if transaction is read_only
@return transaction read_only status */
ib_u32_t
ib_trx_read_only(
/*=============*/
	ib_trx_t	ib_trx)		/*!< in: trx handle */
{
	trx_t*		trx = (trx_t*) ib_trx;

	return(trx->read_only);
}
/*****************************************************************//**
Get a trx start time.
@return trx start_time */
ib_u64_t
ib_trx_get_start_time(
/*==================*/
	ib_trx_t	ib_trx)		/*!< in: transaction */
{
	trx_t*		trx = (trx_t*) ib_trx;
	return(static_cast<ib_u64_t>(trx->start_time));
}
/*****************************************************************//**
Release the resources of the transaction.
@return DB_SUCCESS or err code */
ib_err_t
ib_trx_release(
/*===========*/
	ib_trx_t	ib_trx)		/*!< in: trx handle */
{
	trx_t*		trx = (trx_t*) ib_trx;

	ut_ad(trx != NULL);
	trx_free_for_mysql(trx);

	return(DB_SUCCESS);
}

/*****************************************************************//**
Commit a transaction. This function will also release the schema
latches too.
@return DB_SUCCESS or err code */
ib_err_t
ib_trx_commit(
/*==========*/
	ib_trx_t	ib_trx)		/*!< in: trx handle */
{
	ib_err_t	err = DB_SUCCESS;
	trx_t*		trx = reinterpret_cast<trx_t*>(ib_trx);

	if (!trx_is_started(trx)) {

		return(err);
	}

	trx_commit(trx);

	return(DB_SUCCESS);
}

/*****************************************************************//**
Rollback a transaction. This function will also release the schema
latches too.
@return DB_SUCCESS or err code */
ib_err_t
ib_trx_rollback(
/*============*/
	ib_trx_t	ib_trx)		/*!< in: trx handle */
{
	ib_err_t	err;
	trx_t*		trx = (trx_t*) ib_trx;

	err = static_cast<ib_err_t>(trx_rollback_for_mysql(trx));

        /* It should always succeed */
        ut_a(err == DB_SUCCESS);

	return(err);
}

#ifdef _WIN32
/*****************************************************************//**
Convert a string to lower case. */
static
void
ib_to_lower_case(
/*=============*/
	char*		ptr)		/*!< string to convert to lower case */
{
	while (*ptr) {
		*ptr = tolower(*ptr);
		++ptr;
	}
}
#endif /* _WIN32 */

/*****************************************************************//**
Normalizes a table name string. A normalized name consists of the
database name catenated to '/' and table name. An example:
test/mytable. On Windows normalization puts both the database name and the
table name always to lower case. This function can be called for system
tables and they don't have a database component. For tables that don't have
a database component, we don't normalize them to lower case on Windows.
The assumption is that they are system tables that reside in the system
table space. */
static
void
ib_normalize_table_name(
/*====================*/
	char*		norm_name,	/*!< out: normalized name as a
					null-terminated string */
	const char*	name)		/*!< in: table name string */
{
	const char*	ptr = name;

	/* Scan name from the end */

	ptr += ut_strlen(name) - 1;

	/* Find the start of the table name. */
	while (ptr >= name && *ptr != '\\' && *ptr != '/' && ptr > name) {
		--ptr;
	}


	/* For system tables there is no '/' or dbname. */
	ut_a(ptr >= name);

	if (ptr > name) {
		const char*	db_name;
		const char*	table_name;

		table_name = ptr + 1;

		--ptr;

		while (ptr >= name && *ptr != '\\' && *ptr != '/') {
			ptr--;
		}

		db_name = ptr + 1;

		memcpy(norm_name, db_name,
			ut_strlen(name) + 1 - (db_name - name));

		norm_name[table_name - db_name - 1] = '/';
#ifdef _WIN32
		ib_to_lower_case(norm_name);
#endif
	} else {
		ut_strcpy(norm_name, name);
	}
}

/*****************************************************************//**
Get a table id. The caller must have acquired the dictionary mutex.
@return DB_SUCCESS if found */
static
ib_err_t
ib_table_get_id_low(
/*================*/
	const char*	table_name,	/*!< in: table to find */
	ib_id_u64_t*	table_id)	/*!< out: table id if found */
{
	dict_table_t*	table;
	ib_err_t	err = DB_TABLE_NOT_FOUND;

	*table_id = 0;

	table = ib_lookup_table_by_name(table_name);

	if (table != NULL) {
		*table_id = (table->id);

		err = DB_SUCCESS;
	}

	return(err);
}

/*****************************************************************//**
Create an internal cursor instance.
@return DB_SUCCESS or err code */
static
ib_err_t
ib_create_cursor(
/*=============*/
	ib_crsr_t*	ib_crsr,	/*!< out: InnoDB cursor */
	dict_table_t*	table,		/*!< in: table instance */
	dict_index_t*	index,		/*!< in: index to use */
	trx_t*		trx)		/*!< in: transaction */
{
	mem_heap_t*	heap;
	ib_cursor_t*	cursor;
	ib_err_t	err = DB_SUCCESS;

	heap = mem_heap_create(sizeof(*cursor) * 2);

	if (heap != NULL) {
		row_prebuilt_t*	prebuilt;

		cursor = static_cast<ib_cursor_t*>(
			 mem_heap_zalloc(heap, sizeof(*cursor)));

		cursor->heap = heap;

		cursor->query_heap = mem_heap_create(64);

		if (cursor->query_heap == NULL) {
			mem_heap_free(heap);

			return(DB_OUT_OF_MEMORY);
		}

		cursor->prebuilt = row_create_prebuilt(table, 0);

		prebuilt = cursor->prebuilt;

		prebuilt->trx = trx;

		cursor->valid_trx = TRUE;

		prebuilt->table = table;
		prebuilt->select_lock_type = LOCK_NONE;
		prebuilt->innodb_api = TRUE;

		prebuilt->index = index;

		ut_a(prebuilt->index != NULL);

		if (prebuilt->trx != NULL) {
			++prebuilt->trx->n_mysql_tables_in_use;

			 prebuilt->index_usable =
				row_merge_is_index_usable(
					prebuilt->trx, prebuilt->index);

			/* Assign a read view if the transaction does
			not have it yet */

			trx_assign_read_view(prebuilt->trx);
		}

		*ib_crsr = (ib_crsr_t) cursor;
	} else {
		err = DB_OUT_OF_MEMORY;
	}

	return(err);
}

/*****************************************************************//**
Create an internal cursor instance, and set prebuilt->index to index
with supplied index_id.
@return DB_SUCCESS or err code */
static
ib_err_t
ib_create_cursor_with_index_id(
/*===========================*/
	ib_crsr_t*	ib_crsr,	/*!< out: InnoDB cursor */
	dict_table_t*	table,		/*!< in: table instance */
	ib_id_u64_t	index_id,	/*!< in: index id or 0 */
	trx_t*		trx)		/*!< in: transaction */
{
	dict_index_t*	index;

	if (index_id != 0) {
		mutex_enter(&dict_sys->mutex);
		index = dict_index_find_on_id_low(index_id);
		mutex_exit(&dict_sys->mutex);
	} else {
		index = dict_table_get_first_index(table);
	}

	return(ib_create_cursor(ib_crsr, table, index, trx));
}

/*****************************************************************//**
Open an InnoDB table and return a cursor handle to it.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_open_table_using_id(
/*==========================*/
	ib_id_u64_t	table_id,	/*!< in: table id of table to open */
	ib_trx_t	ib_trx,		/*!< in: Current transaction handle
					can be NULL */
	ib_crsr_t*	ib_crsr)	/*!< out,own: InnoDB cursor */
{
	ib_err_t	err;
	dict_table_t*	table;
	const ib_bool_t	locked
		= ib_trx && ib_schema_lock_is_exclusive(ib_trx);

	table = ib_open_table_by_id(table_id, locked);

	if (table == NULL) {

		return(DB_TABLE_NOT_FOUND);
	}

	err = ib_create_cursor_with_index_id(ib_crsr, table, 0,
					     (trx_t*) ib_trx);

	return(err);
}

/*****************************************************************//**
Open an InnoDB secondary index cursor and return a cursor handle to it.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_open_index_using_name(
/*============================*/
	ib_crsr_t	ib_open_crsr,	/*!< in: open/active cursor */
	const char*	index_name,	/*!< in: secondary index name */
	ib_crsr_t*	ib_crsr,	/*!< out,own: InnoDB index cursor */
	int*		idx_type,	/*!< out: index is cluster index */
	ib_id_u64_t*	idx_id)		/*!< out: index id */
{
	dict_table_t*	table;
	dict_index_t*	index;
	index_id_t	index_id = 0;
	ib_err_t	err = DB_TABLE_NOT_FOUND;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_open_crsr;

	*idx_type = 0;
	*idx_id = 0;
	*ib_crsr = NULL;

	/* We want to increment the ref count, so we do a redundant search. */
	table = dict_table_open_on_id(cursor->prebuilt->table->id,
				      FALSE, DICT_TABLE_OP_NORMAL);
	ut_a(table != NULL);

	/* The first index is always the cluster index. */
	index = dict_table_get_first_index(table);

	/* Traverse the user defined indexes. */
	while (index != NULL) {
		if (innobase_strcasecmp(index->name, index_name) == 0) {
			index_id = index->id;
			*idx_type = index->type;
			*idx_id = index_id;
			break;
		}
		index = UT_LIST_GET_NEXT(indexes, index);
	}

	if (!index_id) {
		dict_table_close(table, FALSE, FALSE);
		return(DB_ERROR);
	}

	if (index_id > 0) {
		ut_ad(index->id == index_id);
		err = ib_create_cursor(
			ib_crsr, table, index, cursor->prebuilt->trx);
	}

	if (*ib_crsr != NULL) {
		const ib_cursor_t*	cursor;

		cursor = *(ib_cursor_t**) ib_crsr;

		if (cursor->prebuilt->index == NULL) {
			err = ib_cursor_close(*ib_crsr);
			ut_a(err == DB_SUCCESS);
			*ib_crsr = NULL;
		}
	}

	return(err);
}

/*****************************************************************//**
Open an InnoDB table and return a cursor handle to it.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_open_table(
/*=================*/
	const char*	name,		/*!< in: table name */
	ib_trx_t	ib_trx,		/*!< in: Current transaction handle
					can be NULL */
	ib_crsr_t*	ib_crsr)	/*!< out,own: InnoDB cursor */
{
	ib_err_t	err;
	dict_table_t*	table;
	char*		normalized_name;

	normalized_name = static_cast<char*>(ut_malloc_nokey(ut_strlen(name)
							     + 1));
	ib_normalize_table_name(normalized_name, name);

	if (ib_trx != NULL) {
		if (!ib_schema_lock_is_exclusive(ib_trx)) {
			table = ib_open_table_by_name(normalized_name);
		} else {
			/* NOTE: We do not acquire MySQL metadata lock */
			table = ib_lookup_table_by_name(normalized_name);
		}
	} else {
		table = ib_open_table_by_name(normalized_name);
	}

	ut_free(normalized_name);
	normalized_name = NULL;

	/* It can happen that another thread has created the table but
	not the cluster index or it's a broken table definition. Refuse to
	open if that's the case. */
	if (table != NULL && dict_table_get_first_index(table) == NULL) {
		table = NULL;
	}

	if (table != NULL) {
		err = ib_create_cursor_with_index_id(ib_crsr, table, 0,
						     (trx_t*) ib_trx);
	} else {
		err = DB_TABLE_NOT_FOUND;
	}

	return(err);
}

/** Check the table whether it contains virtual columns.
@param[in]	crsr	InnoDB Cursor
@return true if table contains virtual column else false. */
ib_bool_t
ib_is_virtual_table(
	ib_crsr_t	crsr)
{
	return(crsr->prebuilt->table->n_v_cols > 0);
}

/********************************************************************//**
Free a context struct for a table handle. */
static
void
ib_qry_proc_free(
/*=============*/
	ib_qry_proc_t*	q_proc)		/*!< in, own: qproc struct */
{
	que_graph_free_recursive(q_proc->grph.ins);
	que_graph_free_recursive(q_proc->grph.upd);
	que_graph_free_recursive(q_proc->grph.sel);

	memset(q_proc, 0x0, sizeof(*q_proc));
}

/*****************************************************************//**
Reset the cursor.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_reset(
/*============*/
	ib_crsr_t	ib_crsr)	/*!< in/out: InnoDB cursor */
{
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	row_prebuilt_t*	prebuilt = cursor->prebuilt;

	if (cursor->valid_trx && prebuilt->trx != NULL
	    && prebuilt->trx->n_mysql_tables_in_use > 0) {

		--prebuilt->trx->n_mysql_tables_in_use;
	}

	/* The fields in this data structure are allocated from
	the query heap and so need to be reset too. */
	ib_qry_proc_free(&cursor->q_proc);

	mem_heap_empty(cursor->query_heap);

	return(DB_SUCCESS);
}

/*****************************************************************//**
update the cursor with new transactions and also reset the cursor
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_new_trx(
/*==============*/
	ib_crsr_t	ib_crsr,	/*!< in/out: InnoDB cursor */
	ib_trx_t	ib_trx)		/*!< in: transaction */
{
	ib_err_t        err = DB_SUCCESS;
	ib_cursor_t*    cursor = (ib_cursor_t*) ib_crsr;
	trx_t*          trx = (trx_t*) ib_trx;

	row_prebuilt_t*	prebuilt = cursor->prebuilt;

	row_update_prebuilt_trx(prebuilt, trx);

	cursor->valid_trx = TRUE;

	trx_assign_read_view(prebuilt->trx);

	ib_qry_proc_free(&cursor->q_proc);

	mem_heap_empty(cursor->query_heap);

	return(err);
}

/*****************************************************************//**
Commit the transaction in a cursor
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_commit_trx(
/*=================*/
	ib_crsr_t	ib_crsr,	/*!< in/out: InnoDB cursor */
	ib_trx_t	ib_trx)		/*!< in: transaction */
{
	ib_err_t        err = DB_SUCCESS;
	ib_cursor_t*    cursor = (ib_cursor_t*) ib_crsr;
#ifdef UNIV_DEBUG
	row_prebuilt_t*	prebuilt = cursor->prebuilt;

	ut_ad(prebuilt->trx == (trx_t*) ib_trx);
#endif /* UNIV_DEBUG */
	ib_trx_commit(ib_trx);
	cursor->valid_trx = FALSE;
	return(err);
}

/*****************************************************************//**
Close an InnoDB table and free the cursor.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_close(
/*============*/
	ib_crsr_t	ib_crsr)	/*!< in,own: InnoDB cursor */
{
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	row_prebuilt_t*	prebuilt;
	trx_t*		trx;

	if (!cursor) {
		return(DB_SUCCESS);
	}

	prebuilt = cursor->prebuilt;
	trx = prebuilt->trx;

	ib_qry_proc_free(&cursor->q_proc);

	/* The transaction could have been detached from the cursor. */
	if (cursor->valid_trx && trx != NULL
	    && trx->n_mysql_tables_in_use > 0) {
		--trx->n_mysql_tables_in_use;
	}

	row_prebuilt_free(prebuilt, FALSE);
	cursor->prebuilt = NULL;

	mem_heap_free(cursor->query_heap);
	mem_heap_free(cursor->heap);
	cursor = NULL;

	return(DB_SUCCESS);
}

/*****************************************************************//**
Close the table, decrement n_ref_count count.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_close_table(
/*==================*/
	ib_crsr_t	ib_crsr)	/*!< in,own: InnoDB cursor */
{
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	row_prebuilt_t*	prebuilt = cursor->prebuilt;

	if (prebuilt && prebuilt->table) {
		dict_table_close(prebuilt->table, FALSE, FALSE);
	}

	return(DB_SUCCESS);
}
/**********************************************************************//**
Run the insert query and do error handling.
@return DB_SUCCESS or error code */
UNIV_INLINE
ib_err_t
ib_insert_row_with_lock_retry(
/*==========================*/
	que_thr_t*	thr,		/*!< in: insert query graph */
	ins_node_t*	node,		/*!< in: insert node for the query */
	trx_savept_t*	savept)		/*!< in: savepoint to rollback to
					in case of an error */
{
	trx_t*		trx;
	ib_err_t	err;
	ib_bool_t	lock_wait;

	trx = thr_get_trx(thr);

	do {
		thr->run_node = node;
		thr->prev_node = node;

		row_ins_step(thr);

		err = trx->error_state;

		if (err != DB_SUCCESS) {
			que_thr_stop_for_mysql(thr);

			thr->lock_state = QUE_THR_LOCK_ROW;
			lock_wait = static_cast<ib_bool_t>(
				ib_handle_errors(&err, trx, thr, savept));
			thr->lock_state = QUE_THR_LOCK_NOLOCK;
		} else {
			lock_wait = FALSE;
		}
	} while (lock_wait);

	return(err);
}

/*****************************************************************//**
Write a row.
@return DB_SUCCESS or err code */
static
ib_err_t
ib_execute_insert_query_graph(
/*==========================*/
	dict_table_t*	table,		/*!< in: table where to insert */
	que_fork_t*	ins_graph,	/*!< in: query graph */
	ins_node_t*	node)		/*!< in: insert node */
{
	trx_t*		trx;
	que_thr_t*	thr;
	trx_savept_t	savept;
	ib_err_t	err = DB_SUCCESS;

	trx = ins_graph->trx;

	savept = trx_savept_take(trx);

	thr = que_fork_get_first_thr(ins_graph);

	que_thr_move_to_run_state_for_mysql(thr, trx);

	err = ib_insert_row_with_lock_retry(thr, node, &savept);

	if (err == DB_SUCCESS) {
		que_thr_stop_for_mysql_no_error(thr, trx);

		dict_table_n_rows_inc(table);

		srv_stats.n_rows_inserted.inc();
	}

	trx->op_info = "";

	return(err);
}

/*****************************************************************//**
Create an insert query graph node. */
static
void
ib_insert_query_graph_create(
/*==========================*/
	ib_cursor_t*	cursor)		/*!< in: Cursor instance */
{
	ib_qry_proc_t*	q_proc = &cursor->q_proc;
	ib_qry_node_t*	node = &q_proc->node;
	trx_t*		trx = cursor->prebuilt->trx;

	ut_a(trx_is_started(trx));

	if (node->ins == NULL) {
		dtuple_t*	row;
		ib_qry_grph_t*	grph = &q_proc->grph;
		mem_heap_t*	heap = cursor->query_heap;
		dict_table_t*	table = cursor->prebuilt->table;

		node->ins = ins_node_create(INS_DIRECT, table, heap);

		node->ins->select = NULL;
		node->ins->values_list = NULL;

		row = dtuple_create(heap, dict_table_get_n_cols(table));
		dict_table_copy_types(row, table);

		ut_ad(!dict_table_have_virtual_index(table));

		ins_node_set_new_row(node->ins, row);

		grph->ins = static_cast<que_fork_t*>(
			que_node_get_parent(
				pars_complete_graph_for_exec(node->ins, trx,
							     heap, NULL)));

		grph->ins->state = QUE_FORK_ACTIVE;
	}
}

/*****************************************************************//**
Insert a row to a table.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_insert_row(
/*=================*/
	ib_crsr_t	ib_crsr,	/*!< in/out: InnoDB cursor instance */
	const ib_tpl_t	ib_tpl)		/*!< in: tuple to insert */
{
	ib_ulint_t	i;
	ib_qry_node_t*	node;
	ib_qry_proc_t*	q_proc;
	ulint		n_fields;
	dtuple_t*	dst_dtuple;
	ib_err_t	err = DB_SUCCESS;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	const ib_tuple_t* src_tuple = (const ib_tuple_t*) ib_tpl;

	ib_insert_query_graph_create(cursor);

	ut_ad(src_tuple->type == TPL_TYPE_ROW);

	q_proc = &cursor->q_proc;
	node = &q_proc->node;

	node->ins->state = INS_NODE_ALLOC_ROW_ID;
	dst_dtuple = node->ins->row;

	n_fields = dtuple_get_n_fields(src_tuple->ptr);
	ut_ad(n_fields == dtuple_get_n_fields(dst_dtuple));

	/* Do a shallow copy of the data fields and check for NULL
	constraints on columns. */
	for (i = 0; i < n_fields; i++) {
		ulint		mtype;
		dfield_t*	src_field;
		dfield_t*	dst_field;

		src_field = dtuple_get_nth_field(src_tuple->ptr, i);

		mtype = dtype_get_mtype(dfield_get_type(src_field));

		/* Don't touch the system columns. */
		if (mtype != DATA_SYS) {
			ulint	prtype;

			prtype = dtype_get_prtype(dfield_get_type(src_field));

			if ((prtype & DATA_NOT_NULL)
			    && dfield_is_null(src_field)) {

				err = DB_DATA_MISMATCH;
				break;
			}

			dst_field = dtuple_get_nth_field(dst_dtuple, i);
			ut_ad(mtype
			      == dtype_get_mtype(dfield_get_type(dst_field)));

			/* Do a shallow copy. */
			dfield_set_data(
				dst_field, src_field->data, src_field->len);

			if (dst_field->len != IB_SQL_NULL) {
				UNIV_MEM_ASSERT_RW(dst_field->data,
						   dst_field->len);
			}
		}
	}

	if (err == DB_SUCCESS) {
		err = ib_execute_insert_query_graph(
			src_tuple->index->table, q_proc->grph.ins, node->ins);
	}

	ib_wake_master_thread();

	return(err);
}

/*********************************************************************//**
Gets pointer to a prebuilt update vector used in updates.
@return update vector */
UNIV_INLINE
upd_t*
ib_update_vector_create(
/*====================*/
	ib_cursor_t*	cursor)		/*!< in: current cursor */
{
	trx_t*		trx = cursor->prebuilt->trx;
	mem_heap_t*	heap = cursor->query_heap;
	dict_table_t*	table = cursor->prebuilt->table;
	ib_qry_proc_t*	q_proc = &cursor->q_proc;
	ib_qry_grph_t*	grph = &q_proc->grph;
	ib_qry_node_t*	node = &q_proc->node;

	ut_a(trx_is_started(trx));

	if (node->upd == NULL) {
		node->upd = static_cast<upd_node_t*>(
			row_create_update_node_for_mysql(table, heap));
	}

	ut_ad(!dict_table_have_virtual_index(table));

	grph->upd = static_cast<que_fork_t*>(
		que_node_get_parent(
			pars_complete_graph_for_exec(node->upd, trx,
						     heap, NULL)));

	grph->upd->state = QUE_FORK_ACTIVE;

	return(node->upd->update);
}

/**********************************************************************//**
Note that a column has changed. */
static
void
ib_update_col(
/*==========*/

	ib_cursor_t*	cursor,		/*!< in: current cursor */
	upd_field_t*	upd_field,	/*!< in/out: update field */
	ulint		col_no,		/*!< in: column number */
	dfield_t*	dfield)		/*!< in: updated dfield */
{
	ulint		data_len;
	dict_table_t*	table = cursor->prebuilt->table;
	dict_index_t*	index = dict_table_get_first_index(table);

	data_len = dfield_get_len(dfield);

	if (data_len == UNIV_SQL_NULL) {
		dfield_set_null(&upd_field->new_val);
	} else {
		dfield_copy_data(&upd_field->new_val, dfield);
	}

	upd_field->exp = NULL;

	upd_field->orig_len = 0;

	upd_field->field_no = dict_col_get_clust_pos(
		&table->cols[col_no], index);
}

/**********************************************************************//**
Checks which fields have changed in a row and stores the new data
to an update vector.
@return DB_SUCCESS or err code */
static
ib_err_t
ib_calc_diff(
/*=========*/
	ib_cursor_t*	cursor,		/*!< in: current cursor */
	upd_t*		upd,		/*!< in/out: update vector */
	const ib_tuple_t*old_tuple,	/*!< in: Old tuple in table */
	const ib_tuple_t*new_tuple)	/*!< in: New tuple to update */
{
	ulint		i;
	ulint		n_changed = 0;
	ib_err_t	err = DB_SUCCESS;
	ulint		n_fields = dtuple_get_n_fields(new_tuple->ptr);

	ut_a(old_tuple->type == TPL_TYPE_ROW);
	ut_a(new_tuple->type == TPL_TYPE_ROW);
	ut_a(old_tuple->index->table == new_tuple->index->table);

	for (i = 0; i < n_fields; ++i) {
		ulint		mtype;
		ulint		prtype;
		upd_field_t*	upd_field;
		dfield_t*	new_dfield;
		dfield_t*	old_dfield;

		new_dfield = dtuple_get_nth_field(new_tuple->ptr, i);
		old_dfield = dtuple_get_nth_field(old_tuple->ptr, i);

		mtype = dtype_get_mtype(dfield_get_type(old_dfield));
		prtype = dtype_get_prtype(dfield_get_type(old_dfield));

		/* Skip the system columns */
		if (mtype == DATA_SYS) {
			continue;

		} else if ((prtype & DATA_NOT_NULL)
			   && dfield_is_null(new_dfield)) {

			err = DB_DATA_MISMATCH;
			break;
		}

		if (dfield_get_len(new_dfield) != dfield_get_len(old_dfield)
		    || (!dfield_is_null(old_dfield)
		        && memcmp(dfield_get_data(new_dfield),
			      dfield_get_data(old_dfield),
			      dfield_get_len(old_dfield)) != 0)) {

			upd_field = &upd->fields[n_changed];

			ib_update_col(cursor, upd_field, i, new_dfield);

			++n_changed;
		}
	}

	if (err == DB_SUCCESS) {
		upd->info_bits = 0;
		upd->n_fields = n_changed;
	}

	return(err);
}

/**********************************************************************//**
Run the update query and do error handling.
@return DB_SUCCESS or error code */
UNIV_INLINE
ib_err_t
ib_update_row_with_lock_retry(
/*==========================*/
	que_thr_t*	thr,		/*!< in: Update query graph */
	upd_node_t*	node,		/*!< in: Update node for the query */
	trx_savept_t*	savept)		/*!< in: savepoint to rollback to
					in case of an error */

{
	trx_t*		trx;
	ib_err_t	err;
	ib_bool_t	lock_wait;

	trx = thr_get_trx(thr);

	do {
		thr->run_node = node;
		thr->prev_node = node;

		row_upd_step(thr);

		err = trx->error_state;

		if (err != DB_SUCCESS) {
			que_thr_stop_for_mysql(thr);

			if (err != DB_RECORD_NOT_FOUND) {
				thr->lock_state = QUE_THR_LOCK_ROW;

				lock_wait = static_cast<ib_bool_t>(
					ib_handle_errors(&err, trx, thr, savept));

				thr->lock_state = QUE_THR_LOCK_NOLOCK;
			} else {
				lock_wait = FALSE;
			}
		} else {
			lock_wait = FALSE;
		}
	} while (lock_wait);

	return(err);
}

/*********************************************************************//**
Does an update or delete of a row.
@return DB_SUCCESS or err code */
UNIV_INLINE
ib_err_t
ib_execute_update_query_graph(
/*==========================*/
	ib_cursor_t*	cursor,		/*!< in: Cursor instance */
	btr_pcur_t*	pcur)		/*!< in: Btree persistent cursor */
{
	ib_err_t	err;
	que_thr_t*	thr;
	upd_node_t*	node;
	trx_savept_t	savept;
	trx_t*		trx = cursor->prebuilt->trx;
	dict_table_t*	table = cursor->prebuilt->table;
	ib_qry_proc_t*	q_proc = &cursor->q_proc;

	/* The transaction must be running. */
	ut_a(trx_is_started(trx));

	node = q_proc->node.upd;

	ut_a(dict_index_is_clust(pcur->btr_cur.index));
	btr_pcur_copy_stored_position(node->pcur, pcur);

	ut_a(node->pcur->rel_pos == BTR_PCUR_ON);

	savept = trx_savept_take(trx);

	thr = que_fork_get_first_thr(q_proc->grph.upd);

	node->state = UPD_NODE_UPDATE_CLUSTERED;

	que_thr_move_to_run_state_for_mysql(thr, trx);

	err = ib_update_row_with_lock_retry(thr, node, &savept);

	if (err == DB_SUCCESS) {

		que_thr_stop_for_mysql_no_error(thr, trx);

		if (node->is_delete) {

			dict_table_n_rows_dec(table);

			srv_stats.n_rows_deleted.inc();
		} else {
			srv_stats.n_rows_updated.inc();
		}

	} else if (err == DB_RECORD_NOT_FOUND) {
		trx->error_state = DB_SUCCESS;
	}

	trx->op_info = "";

	return(err);
}

/*****************************************************************//**
Update a row in a table.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_update_row(
/*=================*/
	ib_crsr_t	ib_crsr,	/*!< in: InnoDB cursor instance */
	const ib_tpl_t	ib_old_tpl,	/*!< in: Old tuple in table */
	const ib_tpl_t	ib_new_tpl)	/*!< in: New tuple to update */
{
	upd_t*		upd;
	ib_err_t	err;
	btr_pcur_t*	pcur;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	row_prebuilt_t*	prebuilt = cursor->prebuilt;
	const ib_tuple_t*old_tuple = (const ib_tuple_t*) ib_old_tpl;
	const ib_tuple_t*new_tuple = (const ib_tuple_t*) ib_new_tpl;

	if (dict_index_is_clust(prebuilt->index)) {
		pcur = cursor->prebuilt->pcur;
	} else if (prebuilt->need_to_access_clustered) {
		pcur = cursor->prebuilt->clust_pcur;
	} else {
		return(DB_ERROR);
	}

	ut_a(old_tuple->type == TPL_TYPE_ROW);
	ut_a(new_tuple->type == TPL_TYPE_ROW);

	upd = ib_update_vector_create(cursor);

	err = ib_calc_diff(cursor, upd, old_tuple, new_tuple);

	if (err == DB_SUCCESS) {
		/* Note that this is not a delete. */
		cursor->q_proc.node.upd->is_delete = FALSE;

		err = ib_execute_update_query_graph(cursor, pcur);
	}

	ib_wake_master_thread();

	return(err);
}

/**********************************************************************//**
Build the update query graph to delete a row from an index.
@return DB_SUCCESS or err code */
static
ib_err_t
ib_delete_row(
/*==========*/
	ib_cursor_t*	cursor,		/*!< in: current cursor */
	btr_pcur_t*	pcur,		/*!< in: Btree persistent cursor */
	const rec_t*	rec)		/*!< in: record to delete */
{
	ulint		i;
	upd_t*		upd;
	ib_err_t	err;
	ib_tuple_t*	tuple;
	ib_tpl_t	ib_tpl;
	ulint		n_cols;
	upd_field_t*	upd_field;
	ib_bool_t	page_format;
	dict_table_t*	table = cursor->prebuilt->table;
	dict_index_t*	index = dict_table_get_first_index(table);

	n_cols = dict_index_get_n_ordering_defined_by_user(index);
	ib_tpl = ib_key_tuple_new(index, n_cols);

	if (!ib_tpl) {
		return(DB_OUT_OF_MEMORY);
	}

	tuple = (ib_tuple_t*) ib_tpl;

	upd = ib_update_vector_create(cursor);

	page_format = static_cast<ib_bool_t>(
		dict_table_is_comp(index->table));
	ib_read_tuple(rec, page_format, tuple, NULL, NULL);

	upd->n_fields = ib_tuple_get_n_cols(ib_tpl);

	for (i = 0; i < upd->n_fields; ++i) {
		dfield_t*	dfield;

		upd_field = &upd->fields[i];
		dfield = dtuple_get_nth_field(tuple->ptr, i);

		dfield_copy_data(&upd_field->new_val, dfield);

		upd_field->exp = NULL;

		upd_field->orig_len = 0;

		upd->info_bits = 0;

		upd_field->field_no = dict_col_get_clust_pos(
			&table->cols[i], index);
	}

	/* Note that this is a delete. */
	cursor->q_proc.node.upd->is_delete = TRUE;

	err = ib_execute_update_query_graph(cursor, pcur);

	ib_tuple_delete(ib_tpl);

	return(err);
}

/*****************************************************************//**
Delete a row in a table.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_delete_row(
/*=================*/
	ib_crsr_t	ib_crsr)	/*!< in: InnoDB cursor instance */
{
	ib_err_t	err;
	btr_pcur_t*	pcur;
	dict_index_t*	index;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	row_prebuilt_t*	prebuilt = cursor->prebuilt;

	index = dict_table_get_first_index(prebuilt->index->table);

	/* Check whether this is a secondary index cursor */
	if (index != prebuilt->index) {
		if (prebuilt->need_to_access_clustered) {
			pcur = prebuilt->clust_pcur;
		} else {
			return(DB_ERROR);
		}
	} else {
		pcur = prebuilt->pcur;
	}

	if (ib_btr_cursor_is_positioned(pcur)) {
		const rec_t*	rec;
		ib_bool_t	page_format;
		mtr_t		mtr;
		rec_t*		copy = NULL;
	        byte		ptr[UNIV_PAGE_SIZE_MAX];

		page_format = static_cast<ib_bool_t>(
			dict_table_is_comp(index->table));

		mtr_start(&mtr);

		if (btr_pcur_restore_position(
			BTR_SEARCH_LEAF, pcur, &mtr)) {
			mem_heap_t*	heap = NULL;
			ulint		offsets_[REC_OFFS_NORMAL_SIZE];
			ulint*		offsets	= offsets_;

			rec_offs_init(offsets_);

			rec = btr_pcur_get_rec(pcur);

			/* Since mtr will be commited, the rec
			will not be protected. Make a copy of
			the rec. */
			offsets = rec_get_offsets(
				rec, index, offsets, ULINT_UNDEFINED, &heap);
			ut_ad(rec_offs_size(offsets) < UNIV_PAGE_SIZE_MAX);
			copy = rec_copy(ptr, rec, offsets);
		}

		mtr_commit(&mtr);

		if (copy && !rec_get_deleted_flag(copy, page_format)) {
			err = ib_delete_row(cursor, pcur, copy);
		} else {
			err = DB_RECORD_NOT_FOUND;
		}
	} else {
		err = DB_RECORD_NOT_FOUND;
	}

	ib_wake_master_thread();

	return(err);
}

/*****************************************************************//**
Read current row.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_read_row(
/*===============*/
	ib_crsr_t	ib_crsr,	/*!< in: InnoDB cursor instance */
	ib_tpl_t	ib_tpl,		/*!< out: read cols into this tuple */
	void**		row_buf,        /*!< in/out: row buffer */
	ib_ulint_t*	row_len)        /*!< in/out: row buffer len */
{
	ib_err_t	err;
	ib_tuple_t*	tuple = (ib_tuple_t*) ib_tpl;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;

	ut_a(trx_is_started(cursor->prebuilt->trx));

	/* When searching with IB_EXACT_MATCH set, row_search_for_mysql()
	will not position the persistent cursor but will copy the record
	found into the row cache. It should be the only entry. */
	if (!ib_cursor_is_positioned(ib_crsr) ) {
		err = DB_RECORD_NOT_FOUND;
	} else {
		mtr_t		mtr;
		btr_pcur_t*	pcur;
		row_prebuilt_t*	prebuilt = cursor->prebuilt;

		if (prebuilt->need_to_access_clustered
		    && tuple->type == TPL_TYPE_ROW) {
			pcur = prebuilt->clust_pcur;
		} else {
			pcur = prebuilt->pcur;
		}

		if (pcur == NULL) {
			return(DB_ERROR);
		}

		mtr_start(&mtr);

		if (btr_pcur_restore_position(BTR_SEARCH_LEAF, pcur, &mtr)) {
			const rec_t*	rec;
			ib_bool_t	page_format;

			page_format = static_cast<ib_bool_t>(
				dict_table_is_comp(tuple->index->table));
			rec = btr_pcur_get_rec(pcur);

			if (!rec_get_deleted_flag(rec, page_format)) {
				if (prebuilt->innodb_api &&
					prebuilt->innodb_api_rec != NULL) {
					rec =prebuilt->innodb_api_rec;
				}
			}

			if (!rec_get_deleted_flag(rec, page_format)) {
				ib_read_tuple(rec, page_format, tuple,
					      row_buf, (ulint*) row_len);
				err = DB_SUCCESS;
			} else{
				err = DB_RECORD_NOT_FOUND;
			}

		} else {
			err = DB_RECORD_NOT_FOUND;
		}

		mtr_commit(&mtr);
	}

	return(err);
}

/*****************************************************************//**
Move cursor to the first record in the table.
@return DB_SUCCESS or err code */
UNIV_INLINE
ib_err_t
ib_cursor_position(
/*===============*/
	ib_cursor_t*	cursor,		/*!< in: InnoDB cursor instance */
	ib_srch_mode_t	mode)		/*!< in: Search mode */
{
	ib_err_t	err;
	row_prebuilt_t*	prebuilt = cursor->prebuilt;
	unsigned char*	buf;

	buf = static_cast<unsigned char*>(ut_malloc_nokey(UNIV_PAGE_SIZE));

	if (prebuilt->innodb_api) {
		prebuilt->cursor_heap = cursor->heap;
	}
	/* We want to position at one of the ends, row_search_for_mysql()
	uses the search_tuple fields to work out what to do. */
	dtuple_set_n_fields(prebuilt->search_tuple, 0);

	err = static_cast<ib_err_t>(row_search_for_mysql(
		buf, static_cast<page_cur_mode_t>(mode), prebuilt, 0, 0));

	ut_free(buf);

	return(err);
}

/*****************************************************************//**
Move cursor to the first record in the table.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_first(
/*============*/
	ib_crsr_t	ib_crsr)	/*!< in: InnoDB cursor instance */
{
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;

	return(ib_cursor_position(cursor, IB_CUR_G));
}

/*****************************************************************//**
Move cursor to the next user record in the table.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_next(
/*===========*/
        ib_crsr_t       ib_crsr)        /*!< in: InnoDB cursor instance */
{
        ib_err_t	err;
        ib_cursor_t*    cursor = (ib_cursor_t*) ib_crsr;
        row_prebuilt_t* prebuilt = cursor->prebuilt;
	byte		buf[UNIV_PAGE_SIZE_MAX];

	if (prebuilt->innodb_api) {
		prebuilt->cursor_heap = cursor->heap;
	}
        /* We want to move to the next record */
        dtuple_set_n_fields(prebuilt->search_tuple, 0);

        err = static_cast<ib_err_t>(row_search_for_mysql(
		buf, PAGE_CUR_G, prebuilt, 0, ROW_SEL_NEXT));

        return(err);
}

/*****************************************************************//**
Search for key.
@return DB_SUCCESS or err code */
ib_err_t
ib_cursor_moveto(
/*=============*/
	ib_crsr_t	ib_crsr,	/*!< in: InnoDB cursor instance */
	ib_tpl_t	ib_tpl,		/*!< in: Key to search for */
	ib_srch_mode_t	ib_srch_mode)	/*!< in: search mode */
{
	ulint		i;
	ulint		n_fields;
	ib_err_t	err = DB_SUCCESS;
	ib_tuple_t*	tuple = (ib_tuple_t*) ib_tpl;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	row_prebuilt_t*	prebuilt = cursor->prebuilt;
	dtuple_t*	search_tuple = prebuilt->search_tuple;
	unsigned char*	buf;

	ut_a(tuple->type == TPL_TYPE_KEY);

	n_fields = dict_index_get_n_ordering_defined_by_user(prebuilt->index);

	if (n_fields > dtuple_get_n_fields(tuple->ptr)) {
		n_fields = dtuple_get_n_fields(tuple->ptr);
	}

	dtuple_set_n_fields(search_tuple, n_fields);
	dtuple_set_n_fields_cmp(search_tuple, n_fields);

	/* Do a shallow copy */
	for (i = 0; i < n_fields; ++i) {
		dfield_copy(dtuple_get_nth_field(search_tuple, i),
			    dtuple_get_nth_field(tuple->ptr, i));
	}

	ut_a(prebuilt->select_lock_type <= LOCK_NUM);

	prebuilt->innodb_api_rec = NULL;

	buf = static_cast<unsigned char*>(ut_malloc_nokey(UNIV_PAGE_SIZE));

	if (prebuilt->innodb_api) {
		prebuilt->cursor_heap = cursor->heap;
	}

	err = static_cast<ib_err_t>(row_search_for_mysql(
		buf, static_cast<page_cur_mode_t>(ib_srch_mode), prebuilt,
		cursor->match_mode, 0));

	ut_free(buf);

	return(err);
}

/*****************************************************************//**
Set the cursor search mode. */
void
ib_cursor_set_match_mode(
/*=====================*/
	ib_crsr_t	ib_crsr,	/*!< in: Cursor instance */
	ib_match_mode_t	match_mode)	/*!< in: ib_cursor_moveto match mode */
{
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;

	cursor->match_mode = match_mode;
}

/*****************************************************************//**
Get the dfield instance for the column in the tuple.
@return dfield instance in tuple */
UNIV_INLINE
dfield_t*
ib_col_get_dfield(
/*==============*/
	ib_tuple_t*	tuple,		/*!< in: tuple instance */
	ulint		col_no)		/*!< in: col no. in tuple */
{
	dfield_t*	dfield;

	dfield = dtuple_get_nth_field(tuple->ptr, col_no);

	return(dfield);
}

/*****************************************************************//**
Predicate to check whether a column type contains variable length data.
@return DB_SUCCESS or error code */
UNIV_INLINE
ib_err_t
ib_col_is_capped(
/*==============*/
	const dtype_t*  dtype)		/*!< in: column type */
{
	return(static_cast<ib_err_t>(
		(dtype_get_mtype(dtype) == DATA_VARCHAR
		|| dtype_get_mtype(dtype) == DATA_CHAR
		|| dtype_get_mtype(dtype) == DATA_MYSQL
		|| dtype_get_mtype(dtype) == DATA_VARMYSQL
		|| dtype_get_mtype(dtype) == DATA_FIXBINARY
		|| dtype_get_mtype(dtype) == DATA_BINARY
		|| dtype_get_mtype(dtype) == DATA_POINT)
	       && dtype_get_len(dtype) > 0));
}

/*****************************************************************//**
Set a column of the tuple. Make a copy using the tuple's heap.
@return DB_SUCCESS or error code */
ib_err_t
ib_col_set_value(
/*=============*/
	ib_tpl_t	ib_tpl,		/*!< in: tuple instance */
	ib_ulint_t	col_no,		/*!< in: column index in tuple */
	const void*	src,		/*!< in: data value */
	ib_ulint_t	len,		/*!< in: data value len */
	ib_bool_t	need_cpy)	/*!< in: if need memcpy */
{
	const dtype_t*  dtype;
	dfield_t*	dfield;
	void*		dst = NULL;
	ib_tuple_t*	tuple = (ib_tuple_t*) ib_tpl;
	ulint		col_len;

	dfield = ib_col_get_dfield(tuple, col_no);

	/* User wants to set the column to NULL. */
	if (len == IB_SQL_NULL) {
		dfield_set_null(dfield);
		return(DB_SUCCESS);
	}

	dtype = dfield_get_type(dfield);
	col_len = dtype_get_len(dtype);

	/* Not allowed to update system columns. */
	if (dtype_get_mtype(dtype) == DATA_SYS) {
		return(DB_DATA_MISMATCH);
	}

	dst = dfield_get_data(dfield);

	/* Since TEXT/CLOB also map to DATA_VARCHAR we need to make an
	exception. Perhaps we need to set the precise type and check
	for that. */
	if (ib_col_is_capped(dtype)) {

		len = ut_min(len, static_cast<ib_ulint_t>(col_len));

		if (dst == NULL || len > dfield_get_len(dfield)) {
			dst = mem_heap_alloc(tuple->heap, col_len);
			ut_a(dst != NULL);
		}
	} else if (dst == NULL || len > dfield_get_len(dfield)) {
		dst = mem_heap_alloc(tuple->heap, len);
	}

	if (dst == NULL) {
		return(DB_OUT_OF_MEMORY);
	}

	switch (dtype_get_mtype(dtype)) {
	case DATA_INT: {

		if (col_len == len) {
			ibool		usign;

			usign = dtype_get_prtype(dtype) & DATA_UNSIGNED;
			mach_write_int_type(static_cast<byte*>(dst),
					    static_cast<const byte*>(src),
					    len, usign);

		} else {
			return(DB_DATA_MISMATCH);
		}
		break;
	}

	case DATA_FLOAT:
		if (len == sizeof(float)) {
			mach_float_write(static_cast<byte*>(dst), *(float*)src);
		} else {
			return(DB_DATA_MISMATCH);
		}
		break;

	case DATA_DOUBLE:
		if (len == sizeof(double)) {
			mach_double_write(static_cast<byte*>(dst),
					  *(double*)src);
		} else {
			return(DB_DATA_MISMATCH);
		}
		break;

	case DATA_SYS:
		ut_error;
		break;

	case DATA_CHAR:
		memcpy(dst, src, len);
		memset((byte*) dst + len, 0x20, col_len - len);
		len = col_len;
		break;

	case DATA_POINT:
		memcpy(dst, src, len);
		break;

	case DATA_BLOB:
	case DATA_VAR_POINT:
	case DATA_GEOMETRY:
	case DATA_BINARY:
	case DATA_DECIMAL:
	case DATA_VARCHAR:
	case DATA_FIXBINARY:
		if (need_cpy) {
			memcpy(dst, src, len);
		} else {
			dfield_set_data(dfield, src, len);
			dst = dfield_get_data(dfield);
		}
		break;

	case DATA_MYSQL:
	case DATA_VARMYSQL: {
		ulint		cset;
		CHARSET_INFO*	cs;
		int		error = 0;
		ulint		true_len = len;

		/* For multi byte character sets we need to
		calculate the true length of the data. */
		cset = dtype_get_charset_coll(
			dtype_get_prtype(dtype));
		cs = all_charsets[cset];
		if (cs) {
			uint pos = (uint)(col_len / cs->mbmaxlen);

			if (len > 0 && cs->mbmaxlen > 1) {
				true_len = (ulint)
					cs->cset->well_formed_len(
						cs,
						(const char*)src,
						(const char*)src + len,
						pos,
						&error);

				if (true_len < len) {
					len = static_cast<ib_ulint_t>(true_len);
				}
			}
		}

		/* All invalid bytes in data need be truncated.
		If len == 0, means all bytes of the data is invalid.
		In this case, the data will be truncated to empty.*/
		memcpy(dst, src, len);

		/* For DATA_MYSQL, need to pad the unused
		space with spaces. */
		if (dtype_get_mtype(dtype) == DATA_MYSQL) {
			ulint		n_chars;

			if (len < col_len) {
				ulint	pad_len = col_len - len;

				ut_a(cs != NULL);
				ut_a(!(pad_len % cs->mbminlen));

				cs->cset->fill(cs, (char*)dst + len,
					       pad_len,
					       0x20 /* space */);
			}

			/* Why we should do below? See function
			row_mysql_store_col_in_innobase_format */

			ut_a(!(dtype_get_len(dtype)
				% dtype_get_mbmaxlen(dtype)));

			n_chars = dtype_get_len(dtype)
				/ dtype_get_mbmaxlen(dtype);

			/* Strip space padding. */
			while (col_len > n_chars
				&& ((char*)dst)[col_len - 1] == 0x20) {
				col_len--;
			}

			len = static_cast<ib_ulint_t>(col_len);
		}
		break;
	}

	default:
		ut_error;
	}

	if (dst != dfield_get_data(dfield)) {
		dfield_set_data(dfield, dst, len);
	} else {
		dfield_set_len(dfield, len);
	}

	return(DB_SUCCESS);
}

/*****************************************************************//**
Get the size of the data available in a column of the tuple.
@return bytes avail or IB_SQL_NULL */
ib_ulint_t
ib_col_get_len(
/*===========*/
	ib_tpl_t	ib_tpl,		/*!< in: tuple instance */
	ib_ulint_t	i)		/*!< in: column index in tuple */
{
	const dfield_t*		dfield;
	ulint			data_len;
	ib_tuple_t*		tuple = (ib_tuple_t*) ib_tpl;

	dfield = ib_col_get_dfield(tuple, i);

	data_len = dfield_get_len(dfield);

	return(static_cast<ib_ulint_t>(
		data_len == UNIV_SQL_NULL ? IB_SQL_NULL : data_len));
}

/*****************************************************************//**
Copy a column value from the tuple.
@return bytes copied or IB_SQL_NULL */
UNIV_INLINE
ib_ulint_t
ib_col_copy_value_low(
/*==================*/
	ib_tpl_t	ib_tpl,		/*!< in: tuple instance */
	ib_ulint_t	i,		/*!< in: column index in tuple */
	void*		dst,		/*!< out: copied data value */
	ib_ulint_t	len)		/*!< in: max data value len to copy */
{
	const void*	data;
	const dfield_t*	dfield;
	ulint		data_len;
	ib_tuple_t*	tuple = (ib_tuple_t*) ib_tpl;

	dfield = ib_col_get_dfield(tuple, i);

	data = dfield_get_data(dfield);
	data_len = dfield_get_len(dfield);

	if (data_len != UNIV_SQL_NULL) {

		const dtype_t*  dtype = dfield_get_type(dfield);

		switch (dtype_get_mtype(dfield_get_type(dfield))) {
		case DATA_INT: {
			ibool		usign;
			uintmax_t	ret;

			ut_a(data_len == len);

			usign = dtype_get_prtype(dtype) & DATA_UNSIGNED;
			ret = mach_read_int_type(static_cast<const byte*>(data),
						 data_len, usign);

			if (usign) {
				if (len == 1) {
					*(ib_i8_t*)dst = (ib_i8_t)ret;
				} else if (len == 2) {
					*(ib_i16_t*)dst = (ib_i16_t)ret;
				} else if (len == 4) {
					*(ib_i32_t*)dst = (ib_i32_t)ret;
				} else {
					*(ib_i64_t*)dst = (ib_i64_t)ret;
				}
			} else {
				if (len == 1) {
					*(ib_u8_t*)dst = (ib_i8_t)ret;
				} else if (len == 2) {
					*(ib_u16_t*)dst = (ib_i16_t)ret;
				} else if (len == 4) {
					*(ib_u32_t*)dst = (ib_i32_t)ret;
				} else {
					*(ib_u64_t*)dst = (ib_i64_t)ret;
				}
			}

			break;
		}
		case DATA_FLOAT:
			if (len == data_len) {
				float	f;

				ut_a(data_len == sizeof(f));
				f = mach_float_read(static_cast<const byte*>(
					data));
				memcpy(dst, &f, sizeof(f));
			} else {
				data_len = 0;
			}
			break;
		case DATA_DOUBLE:
			if (len == data_len) {
				double	d;

				ut_a(data_len == sizeof(d));
				d = mach_double_read(static_cast<const byte*>(
					data));
				memcpy(dst, &d, sizeof(d));
			} else {
				data_len = 0;
			}
			break;
		default:
			data_len = ut_min(data_len, len);
			memcpy(dst, data, data_len);
		}
	} else {
		data_len = IB_SQL_NULL;
	}

	return(static_cast<ib_ulint_t>(data_len));
}

/*****************************************************************//**
Copy a column value from the tuple.
@return bytes copied or IB_SQL_NULL */
ib_ulint_t
ib_col_copy_value(
/*==============*/
	ib_tpl_t	ib_tpl,		/*!< in: tuple instance */
	ib_ulint_t	i,		/*!< in: column index in tuple */
	void*		dst,		/*!< out: copied data value */
	ib_ulint_t	len)		/*!< in: max data value len to copy */
{
	return(ib_col_copy_value_low(ib_tpl, i, dst, len));
}

/*****************************************************************//**
Get the InnoDB column attribute from the internal column precise type.
@return precise type in api format */
UNIV_INLINE
ib_col_attr_t
ib_col_get_attr(
/*============*/
	ulint		prtype)		/*!< in: column definition */
{
	ib_col_attr_t	attr = IB_COL_NONE;

	if (prtype & DATA_UNSIGNED) {
		attr = static_cast<ib_col_attr_t>(attr | IB_COL_UNSIGNED);
	}

	if (prtype & DATA_NOT_NULL) {
		attr = static_cast<ib_col_attr_t>(attr | IB_COL_NOT_NULL);
	}

	return(attr);
}

/*****************************************************************//**
Get a column name from the tuple.
@return name of the column */
const char*
ib_col_get_name(
/*============*/
	ib_crsr_t       ib_crsr,        /*!< in: InnoDB cursor instance */
	ib_ulint_t	i)		/*!< in: column index in tuple */
{
	const char*	name;
	ib_cursor_t*    cursor = (ib_cursor_t*) ib_crsr;
	dict_table_t*	table = cursor->prebuilt->table;
	dict_col_t*     col = dict_table_get_nth_col(table, i);
	ulint           col_no = dict_col_get_no(col);

	name = dict_table_get_col_name(table, col_no);

	return(name);
}

/*****************************************************************//**
Get an index field name from the cursor.
@return name of the field */
const char*
ib_get_idx_field_name(
/*==================*/
	ib_crsr_t       ib_crsr,        /*!< in: InnoDB cursor instance */
	ib_ulint_t	i)		/*!< in: column index in tuple */
{
	ib_cursor_t*    cursor = (ib_cursor_t*) ib_crsr;
	dict_index_t*	index = cursor->prebuilt->index;
	dict_field_t* 	field;

	if (index) {
		field = dict_index_get_nth_field(cursor->prebuilt->index, i);

		if (field) {
			return(field->name);
		}
	}

	return(NULL);
}

/*****************************************************************//**
Get a column type, length and attributes from the tuple.
@return len of column data */
UNIV_INLINE
ib_ulint_t
ib_col_get_meta_low(
/*================*/
	ib_tpl_t	ib_tpl,		/*!< in: tuple instance */
	ib_ulint_t	i,		/*!< in: column index in tuple */
	ib_col_meta_t*	ib_col_meta)	/*!< out: column meta data */
{
	ib_u16_t	prtype;
	const dfield_t*	dfield;
	ulint		data_len;
	ib_tuple_t*	tuple = (ib_tuple_t*) ib_tpl;

	dfield = ib_col_get_dfield(tuple, i);

	data_len = dfield_get_len(dfield);

	/* We assume 1-1 mapping between the ENUM and internal type codes. */
	ib_col_meta->type = static_cast<ib_col_type_t>(
		dtype_get_mtype(dfield_get_type(dfield)));

	ib_col_meta->type_len = static_cast<ib_u32_t>(
		dtype_get_len(dfield_get_type(dfield)));

	prtype = (ib_u16_t) dtype_get_prtype(dfield_get_type(dfield));

	ib_col_meta->attr = ib_col_get_attr(prtype);
	ib_col_meta->client_type = prtype & DATA_MYSQL_TYPE_MASK;

	return(static_cast<ib_ulint_t>(data_len));
}

/*************************************************************//**
Read a signed int 8 bit column from an InnoDB tuple. */
UNIV_INLINE
ib_err_t
ib_tuple_check_int(
/*===============*/
	ib_tpl_t		ib_tpl,	/*!< in: InnoDB tuple */
	ib_ulint_t		i,	/*!< in: column number */
	ib_bool_t		usign,	/*!< in: true if unsigned */
	ulint			size)	/*!< in: size of integer */
{
	ib_col_meta_t		ib_col_meta;

	ib_col_get_meta_low(ib_tpl, i, &ib_col_meta);

	if (ib_col_meta.type != IB_INT) {
		return(DB_DATA_MISMATCH);
	} else if (ib_col_meta.type_len == IB_SQL_NULL) {
		return(DB_UNDERFLOW);
	} else if (ib_col_meta.type_len != size) {
		return(DB_DATA_MISMATCH);
	} else if ((ib_col_meta.attr & IB_COL_UNSIGNED) && !usign) {
		return(DB_DATA_MISMATCH);
	}

	return(DB_SUCCESS);
}

/*************************************************************//**
Read a signed int 8 bit column from an InnoDB tuple.
@return DB_SUCCESS or error */
ib_err_t
ib_tuple_read_i8(
/*=============*/
	ib_tpl_t		ib_tpl,	/*!< in: InnoDB tuple */
	ib_ulint_t		i,	/*!< in: column number */
	ib_i8_t*		ival)	/*!< out: integer value */
{
	ib_err_t		err;

	err = ib_tuple_check_int(ib_tpl, i, IB_FALSE, sizeof(*ival));

	if (err == DB_SUCCESS) {
		ib_col_copy_value_low(ib_tpl, i, ival, sizeof(*ival));
	}

	return(err);
}

/*************************************************************//**
Read an unsigned int 8 bit column from an InnoDB tuple.
@return DB_SUCCESS or error */
ib_err_t
ib_tuple_read_u8(
/*=============*/
	ib_tpl_t		ib_tpl,	/*!< in: InnoDB tuple */
	ib_ulint_t		i,	/*!< in: column number */
	ib_u8_t*		ival)	/*!< out: integer value */
{
	ib_err_t		err;

	err = ib_tuple_check_int(ib_tpl, i, IB_TRUE, sizeof(*ival));

	if (err == DB_SUCCESS) {
		ib_col_copy_value_low(ib_tpl, i, ival, sizeof(*ival));
	}

	return(err);
}

/*************************************************************//**
Read a signed int 16 bit column from an InnoDB tuple.
@return DB_SUCCESS or error */
ib_err_t
ib_tuple_read_i16(
/*==============*/
	ib_tpl_t		ib_tpl,	/*!< in: InnoDB tuple */
	ib_ulint_t		i,	/*!< in: column number */
	ib_i16_t*		ival)	/*!< out: integer value */
{
	ib_err_t		err;

	err = ib_tuple_check_int(ib_tpl, i, FALSE, sizeof(*ival));

	if (err == DB_SUCCESS) {
		ib_col_copy_value_low(ib_tpl, i, ival, sizeof(*ival));
	}

	return(err);
}

/*************************************************************//**
Read an unsigned int 16 bit column from an InnoDB tuple.
@return DB_SUCCESS or error */
ib_err_t
ib_tuple_read_u16(
/*==============*/
	ib_tpl_t		ib_tpl,	/*!< in: InnoDB tuple */
	ib_ulint_t		i,	/*!< in: column number */
	ib_u16_t*		ival)	/*!< out: integer value */
{
	ib_err_t		err;

	err = ib_tuple_check_int(ib_tpl, i, IB_TRUE, sizeof(*ival));

	if (err == DB_SUCCESS) {
		ib_col_copy_value_low(ib_tpl, i, ival, sizeof(*ival));
	}

	return(err);
}

/*************************************************************//**
Read a signed int 32 bit column from an InnoDB tuple.
@return DB_SUCCESS or error */
ib_err_t
ib_tuple_read_i32(
/*==============*/
	ib_tpl_t		ib_tpl,	/*!< in: InnoDB tuple */
	ib_ulint_t		i,	/*!< in: column number */
	ib_i32_t*		ival)	/*!< out: integer value */
{
	ib_err_t		err;

	err = ib_tuple_check_int(ib_tpl, i, FALSE, sizeof(*ival));

	if (err == DB_SUCCESS) {
		ib_col_copy_value_low(ib_tpl, i, ival, sizeof(*ival));
	}

	return(err);
}

/*************************************************************//**
Read an unsigned int 32 bit column from an InnoDB tuple.
@return DB_SUCCESS or error */
ib_err_t
ib_tuple_read_u32(
/*==============*/
	ib_tpl_t		ib_tpl,	/*!< in: InnoDB tuple */
	ib_ulint_t		i,	/*!< in: column number */
	ib_u32_t*		ival)	/*!< out: integer value */
{
	ib_err_t		err;

	err = ib_tuple_check_int(ib_tpl, i, IB_TRUE, sizeof(*ival));

	if (err == DB_SUCCESS) {
		ib_col_copy_value_low(ib_tpl, i, ival, sizeof(*ival));
	}

	return(err);
}

/*************************************************************//**
Read a signed int 64 bit column from an InnoDB tuple.
@return DB_SUCCESS or error */
ib_err_t
ib_tuple_read_i64(
/*==============*/
	ib_tpl_t		ib_tpl,	/*!< in: InnoDB tuple */
	ib_ulint_t		i,	/*!< in: column number */
	ib_i64_t*		ival)	/*!< out: integer value */
{
	ib_err_t		err;

	err = ib_tuple_check_int(ib_tpl, i, FALSE, sizeof(*ival));

	if (err == DB_SUCCESS) {
		ib_col_copy_value_low(ib_tpl, i, ival, sizeof(*ival));
	}

	return(err);
}

/*************************************************************//**
Read an unsigned int 64 bit column from an InnoDB tuple.
@return DB_SUCCESS or error */
ib_err_t
ib_tuple_read_u64(
/*==============*/
	ib_tpl_t		ib_tpl,	/*!< in: InnoDB tuple */
	ib_ulint_t		i,	/*!< in: column number */
	ib_u64_t*		ival)	/*!< out: integer value */
{
	ib_err_t		err;

	err = ib_tuple_check_int(ib_tpl, i, IB_TRUE, sizeof(*ival));

	if (err == DB_SUCCESS) {
		ib_col_copy_value_low(ib_tpl, i, ival, sizeof(*ival));
	}

	return(err);
}

/*****************************************************************//**
Get a column value pointer from the tuple.
@return NULL or pointer to buffer */
const void*
ib_col_get_value(
/*=============*/
	ib_tpl_t	ib_tpl,		/*!< in: tuple instance */
	ib_ulint_t	i)		/*!< in: column index in tuple */
{
	const void*	data;
	const dfield_t*	dfield;
	ulint		data_len;
	ib_tuple_t*	tuple = (ib_tuple_t*) ib_tpl;

	dfield = ib_col_get_dfield(tuple, i);

	data = dfield_get_data(dfield);
	data_len = dfield_get_len(dfield);

	return(data_len != UNIV_SQL_NULL ? data : NULL);
}

/*****************************************************************//**
Get a column type, length and attributes from the tuple.
@return len of column data */
ib_ulint_t
ib_col_get_meta(
/*============*/
	ib_tpl_t	ib_tpl,		/*!< in: tuple instance */
	ib_ulint_t	i,		/*!< in: column index in tuple */
	ib_col_meta_t*	ib_col_meta)	/*!< out: column meta data */
{
	return(ib_col_get_meta_low(ib_tpl, i, ib_col_meta));
}

/*****************************************************************//**
"Clear" or reset an InnoDB tuple. We free the heap and recreate the tuple.
@return new tuple, or NULL */
ib_tpl_t
ib_tuple_clear(
/*============*/
	ib_tpl_t	ib_tpl)		/*!< in,own: tuple (will be freed) */
{
	const dict_index_t*	index;
	ulint			n_cols;
	ib_tuple_t*		tuple	= (ib_tuple_t*) ib_tpl;
	ib_tuple_type_t		type	= tuple->type;
	mem_heap_t*		heap	= tuple->heap;

	index = tuple->index;
	n_cols = dtuple_get_n_fields(tuple->ptr);

	mem_heap_empty(heap);

	if (type == TPL_TYPE_ROW) {
		return(ib_row_tuple_new_low(index, n_cols, heap));
	} else {
		return(ib_key_tuple_new_low(index, n_cols, heap));
	}
}

/*****************************************************************//**
Create a new cluster key search tuple and copy the contents of  the
secondary index key tuple columns that refer to the cluster index record
to the cluster key. It does a deep copy of the column data.
@return DB_SUCCESS or error code */
ib_err_t
ib_tuple_get_cluster_key(
/*=====================*/
	ib_crsr_t	ib_crsr,	/*!< in: secondary index cursor */
	ib_tpl_t*	ib_dst_tpl,	/*!< out,own: destination tuple */
	const ib_tpl_t	ib_src_tpl)	/*!< in: source tuple */
{
	ulint		i;
	ulint		n_fields;
	ib_err_t	err = DB_SUCCESS;
	ib_tuple_t*	dst_tuple = NULL;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	ib_tuple_t*	src_tuple = (ib_tuple_t*) ib_src_tpl;
	dict_index_t*	clust_index;

	clust_index = dict_table_get_first_index(cursor->prebuilt->table);

	/* We need to ensure that the src tuple belongs to the same table
	as the open cursor and that it's not a tuple for a cluster index. */
	if (src_tuple->type != TPL_TYPE_KEY) {
		return(DB_ERROR);
	} else if (src_tuple->index->table != cursor->prebuilt->table) {
		return(DB_DATA_MISMATCH);
	} else if (src_tuple->index == clust_index) {
		return(DB_ERROR);
	}

	/* Create the cluster index key search tuple. */
	*ib_dst_tpl = ib_clust_search_tuple_create(ib_crsr);

	if (!*ib_dst_tpl) {
		return(DB_OUT_OF_MEMORY);
	}

	dst_tuple = (ib_tuple_t*) *ib_dst_tpl;
	ut_a(dst_tuple->index == clust_index);

	n_fields = dict_index_get_n_unique(dst_tuple->index);

	/* Do a deep copy of the data fields. */
	for (i = 0; i < n_fields; i++) {
		ulint		pos;
		dfield_t*	src_field;
		dfield_t*	dst_field;

		pos = dict_index_get_nth_field_pos(
			src_tuple->index, dst_tuple->index, i);

		ut_a(pos != ULINT_UNDEFINED);

		src_field = dtuple_get_nth_field(src_tuple->ptr, pos);
		dst_field = dtuple_get_nth_field(dst_tuple->ptr, i);

		if (!dfield_is_null(src_field)) {
			UNIV_MEM_ASSERT_RW(src_field->data, src_field->len);

			dst_field->data = mem_heap_dup(
				dst_tuple->heap,
				src_field->data,
				src_field->len);

			dst_field->len = src_field->len;
		} else {
			dfield_set_null(dst_field);
		}
	}

	return(err);
}

/*****************************************************************//**
Create an InnoDB tuple used for index/table search.
@return own: Tuple for current index */
ib_tpl_t
ib_sec_search_tuple_create(
/*=======================*/
	ib_crsr_t	ib_crsr)	/*!< in: Cursor instance */
{
	ulint		n_cols;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	dict_index_t*	index = cursor->prebuilt->index;

	n_cols = dict_index_get_n_unique_in_tree(index);
	return(ib_key_tuple_new(index, n_cols));
}

/*****************************************************************//**
Create an InnoDB tuple used for index/table search.
@return own: Tuple for current index */
ib_tpl_t
ib_sec_read_tuple_create(
/*=====================*/
	ib_crsr_t	ib_crsr)	/*!< in: Cursor instance */
{
	ulint		n_cols;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	dict_index_t*	index = cursor->prebuilt->index;

	n_cols = dict_index_get_n_fields(index);
	return(ib_row_tuple_new(index, n_cols));
}

/*****************************************************************//**
Create an InnoDB tuple used for table key operations.
@return own: Tuple for current table */
ib_tpl_t
ib_clust_search_tuple_create(
/*=========================*/
	ib_crsr_t	ib_crsr)	/*!< in: Cursor instance */
{
	ulint		n_cols;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	dict_index_t*	index;

	index = dict_table_get_first_index(cursor->prebuilt->table);

	n_cols = dict_index_get_n_ordering_defined_by_user(index);
	return(ib_key_tuple_new(index, n_cols));
}

/*****************************************************************//**
Create an InnoDB tuple for table row operations.
@return own: Tuple for current table */
ib_tpl_t
ib_clust_read_tuple_create(
/*=======================*/
	ib_crsr_t	ib_crsr)	/*!< in: Cursor instance */
{
	ulint		n_cols;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	dict_index_t*	index;

	index = dict_table_get_first_index(cursor->prebuilt->table);

	n_cols = dict_table_get_n_cols(cursor->prebuilt->table);
	return(ib_row_tuple_new(index, n_cols));
}

/*****************************************************************//**
Return the number of user columns in the tuple definition.
@return number of user columns */
ib_ulint_t
ib_tuple_get_n_user_cols(
/*=====================*/
	const ib_tpl_t	ib_tpl)		/*!< in: Tuple for current table */
{
	const ib_tuple_t*	tuple = (const ib_tuple_t*) ib_tpl;

	if (tuple->type == TPL_TYPE_ROW) {
		return(static_cast<ib_ulint_t>(
			dict_table_get_n_user_cols(tuple->index->table)));
	}

	return(static_cast<ib_ulint_t>(
		dict_index_get_n_ordering_defined_by_user(tuple->index)));
}

/*****************************************************************//**
Return the number of columns in the tuple definition.
@return number of columns */
ib_ulint_t
ib_tuple_get_n_cols(
/*================*/
	const ib_tpl_t	ib_tpl)		/*!< in: Tuple for table/index */
{
	const ib_tuple_t*	tuple = (const ib_tuple_t*) ib_tpl;

	return(static_cast<ib_ulint_t>(dtuple_get_n_fields(tuple->ptr)));
}

/*****************************************************************//**
Destroy an InnoDB tuple. */
void
ib_tuple_delete(
/*============*/
	ib_tpl_t	ib_tpl)		/*!< in,own: Tuple instance to delete */
{
	ib_tuple_t*	tuple = (ib_tuple_t*) ib_tpl;

	if (!ib_tpl) {
		return;
	}

	mem_heap_free(tuple->heap);
}

/*****************************************************************//**
Get a table id. This function will acquire the dictionary mutex.
@return DB_SUCCESS if found */
ib_err_t
ib_table_get_id(
/*============*/
	const char*	table_name,	/*!< in: table to find */
	ib_id_u64_t*	table_id)	/*!< out: table id if found */
{
	ib_err_t	err;

	dict_mutex_enter_for_mysql();

	err = ib_table_get_id_low(table_name, table_id);

	dict_mutex_exit_for_mysql();

	return(err);
}

/*****************************************************************//**
Check if cursor is positioned.
@return IB_TRUE if positioned */
ib_bool_t
ib_cursor_is_positioned(
/*====================*/
	const ib_crsr_t	ib_crsr)	/*!< in: InnoDB cursor instance */
{
	const ib_cursor_t*	cursor = (const ib_cursor_t*) ib_crsr;
	row_prebuilt_t*		prebuilt = cursor->prebuilt;

	return(ib_btr_cursor_is_positioned(prebuilt->pcur));
}


/*****************************************************************//**
Checks if the data dictionary is latched in exclusive mode.
@return TRUE if exclusive latch */
ib_bool_t
ib_schema_lock_is_exclusive(
/*========================*/
	const ib_trx_t	ib_trx)		/*!< in: transaction */
{
	const trx_t*	trx = (const trx_t*) ib_trx;

	return(trx->dict_operation_lock_mode == RW_X_LATCH);
}

/*****************************************************************//**
Checks if the data dictionary is latched in shared mode.
@return TRUE if shared latch */
ib_bool_t
ib_schema_lock_is_shared(
/*=====================*/
	const ib_trx_t	ib_trx)		/*!< in: transaction */
{
	const trx_t*	trx = (const trx_t*) ib_trx;

	return(trx->dict_operation_lock_mode == RW_S_LATCH);
}

/*****************************************************************//**
Set the Lock an InnoDB cursor/table.
@return DB_SUCCESS or error code */
ib_err_t
ib_cursor_lock(
/*===========*/
	ib_crsr_t	ib_crsr,	/*!< in/out: InnoDB cursor */
	ib_lck_mode_t	ib_lck_mode)	/*!< in: InnoDB lock mode */
{
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	row_prebuilt_t*	prebuilt = cursor->prebuilt;
	trx_t*		trx = prebuilt->trx;
	dict_table_t*	table = prebuilt->table;

	return(ib_trx_lock_table_with_retry(
		trx, table, (enum lock_mode) ib_lck_mode));
}

/*****************************************************************//**
Set the Lock an InnoDB table using the table id.
@return DB_SUCCESS or error code */
ib_err_t
ib_table_lock(
/*==========*/
	ib_trx_t	ib_trx,		/*!< in/out: transaction */
	ib_id_u64_t	table_id,	/*!< in: table id */
	ib_lck_mode_t	ib_lck_mode)	/*!< in: InnoDB lock mode */
{
	ib_err_t	err;
	que_thr_t*	thr;
	mem_heap_t*	heap;
	dict_table_t*	table;
	ib_qry_proc_t	q_proc;
	trx_t*		trx = (trx_t*) ib_trx;

	ut_ad(trx_is_started(trx));

	table = ib_open_table_by_id(table_id, FALSE);

	if (table == NULL) {
		return(DB_TABLE_NOT_FOUND);
	}

	ut_a(ib_lck_mode <= static_cast<ib_lck_mode_t>(LOCK_NUM));
	ut_ad(!dict_table_have_virtual_index(table));

	heap = mem_heap_create(128);

	q_proc.node.sel = sel_node_create(heap);

	thr = pars_complete_graph_for_exec(q_proc.node.sel, trx, heap, NULL);

	q_proc.grph.sel = static_cast<que_fork_t*>(que_node_get_parent(thr));
	q_proc.grph.sel->state = QUE_FORK_ACTIVE;

	trx->op_info = "setting table lock";

	ut_a(ib_lck_mode == IB_LOCK_IS || ib_lck_mode == IB_LOCK_IX);
	err = static_cast<ib_err_t>(
		lock_table(0, table, (enum lock_mode) ib_lck_mode, thr));

	trx->error_state = err;

	mem_heap_free(heap);

	return(err);
}

/*****************************************************************//**
Unlock an InnoDB table.
@return DB_SUCCESS or error code */
ib_err_t
ib_cursor_unlock(
/*=============*/
	ib_crsr_t	ib_crsr)	/*!< in/out: InnoDB cursor */
{
	ib_err_t	err = DB_SUCCESS;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	row_prebuilt_t*	prebuilt = cursor->prebuilt;

	if (prebuilt->trx->mysql_n_tables_locked > 0) {
		--prebuilt->trx->mysql_n_tables_locked;
	} else {
		err = DB_ERROR;
	}

	return(err);
}

/*****************************************************************//**
Set the Lock mode of the cursor.
@return DB_SUCCESS or error code */
ib_err_t
ib_cursor_set_lock_mode(
/*====================*/
	ib_crsr_t	ib_crsr,	/*!< in/out: InnoDB cursor */
	ib_lck_mode_t	ib_lck_mode)	/*!< in: InnoDB lock mode */
{
	ib_err_t	err = DB_SUCCESS;
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	row_prebuilt_t*	prebuilt = cursor->prebuilt;

	ut_a(ib_lck_mode <= static_cast<ib_lck_mode_t>(LOCK_NUM));

	if (ib_lck_mode == IB_LOCK_X) {
		err = ib_cursor_lock(ib_crsr, IB_LOCK_IX);
	} else if (ib_lck_mode == IB_LOCK_S) {
		err = ib_cursor_lock(ib_crsr, IB_LOCK_IS);
	}

	if (err == DB_SUCCESS) {
		prebuilt->select_lock_type = (lock_mode) ib_lck_mode;
		ut_a(trx_is_started(prebuilt->trx));
	}

	return(err);
}

/*****************************************************************//**
Set need to access clustered index record. */
void
ib_cursor_set_cluster_access(
/*=========================*/
	ib_crsr_t	ib_crsr)	/*!< in/out: InnoDB cursor */
{
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;
	row_prebuilt_t*	prebuilt = cursor->prebuilt;

	prebuilt->need_to_access_clustered = TRUE;
}

/*****************************************************************//**
Inform the cursor that it's the start of an SQL statement. */
void
ib_cursor_stmt_begin(
/*=================*/
	ib_crsr_t	ib_crsr)	/*!< in: cursor */
{
	ib_cursor_t*	cursor = (ib_cursor_t*) ib_crsr;

	cursor->prebuilt->sql_stat_start = TRUE;
}

/*****************************************************************//**
Write a double value to a column.
@return DB_SUCCESS or error */
ib_err_t
ib_tuple_write_double(
/*==================*/
	ib_tpl_t	ib_tpl,		/*!< in/out: tuple to write to */
	int		col_no,		/*!< in: column number */
	double		val)		/*!< in: value to write */
{
	const dfield_t*	dfield;
	ib_tuple_t*	tuple = (ib_tuple_t*) ib_tpl;

	dfield = ib_col_get_dfield(tuple, col_no);

	if (dtype_get_mtype(dfield_get_type(dfield)) == DATA_DOUBLE) {
		return(ib_col_set_value(ib_tpl, col_no,
					&val, sizeof(val), true));
	} else {
		return(DB_DATA_MISMATCH);
	}
}

/*************************************************************//**
Read a double column value from an InnoDB tuple.
@return DB_SUCCESS or error */
ib_err_t
ib_tuple_read_double(
/*=================*/
	ib_tpl_t	ib_tpl,		/*!< in: InnoDB tuple */
	ib_ulint_t	col_no,		/*!< in: column number */
	double*		dval)		/*!< out: double value */
{
	ib_err_t	err;
	const dfield_t*	dfield;
	ib_tuple_t*	tuple = (ib_tuple_t*) ib_tpl;

	dfield = ib_col_get_dfield(tuple, col_no);

	if (dtype_get_mtype(dfield_get_type(dfield)) == DATA_DOUBLE) {
		ib_col_copy_value_low(ib_tpl, col_no, dval, sizeof(*dval));
		err = DB_SUCCESS;
	} else {
		err = DB_DATA_MISMATCH;
	}

	return(err);
}

/*****************************************************************//**
Write a float value to a column.
@return DB_SUCCESS or error */
ib_err_t
ib_tuple_write_float(
/*=================*/
	ib_tpl_t	ib_tpl,		/*!< in/out: tuple to write to */
	int		col_no,		/*!< in: column number */
	float		val)		/*!< in: value to write */
{
	const dfield_t*	dfield;
	ib_tuple_t*	tuple = (ib_tuple_t*) ib_tpl;

	dfield = ib_col_get_dfield(tuple, col_no);

	if (dtype_get_mtype(dfield_get_type(dfield)) == DATA_FLOAT) {
		return(ib_col_set_value(ib_tpl, col_no,
					&val, sizeof(val), true));
	} else {
		return(DB_DATA_MISMATCH);
	}
}

/*************************************************************//**
Read a float value from an InnoDB tuple.
@return DB_SUCCESS or error */
ib_err_t
ib_tuple_read_float(
/*================*/
	ib_tpl_t	ib_tpl,		/*!< in: InnoDB tuple */
	ib_ulint_t	col_no,		/*!< in: column number */
	float*		fval)		/*!< out: float value */
{
	ib_err_t	err;
	const dfield_t*	dfield;
	ib_tuple_t*	tuple = (ib_tuple_t*) ib_tpl;

	dfield = ib_col_get_dfield(tuple, col_no);

	if (dtype_get_mtype(dfield_get_type(dfield)) == DATA_FLOAT) {
		ib_col_copy_value_low(ib_tpl, col_no, fval, sizeof(*fval));
		err = DB_SUCCESS;
	} else {
		err = DB_DATA_MISMATCH;
	}

	return(err);
}

/*****************************************************************//**
Truncate a table. The cursor handle will be closed and set to NULL
on success.
@return DB_SUCCESS or error code */
ib_err_t
ib_cursor_truncate(
/*===============*/
	ib_crsr_t*	ib_crsr,	/*!< in/out: cursor for table
					to truncate */
	ib_id_u64_t*	table_id)	/*!< out: new table id */
{
	ib_err_t        err;
	ib_cursor_t*    cursor = *(ib_cursor_t**) ib_crsr;
	row_prebuilt_t* prebuilt = cursor->prebuilt;

	*table_id = 0;

	err = ib_cursor_lock(*ib_crsr, IB_LOCK_X);

	if (err == DB_SUCCESS) {
		trx_t*          trx;
		dict_table_t*   table = prebuilt->table;

		/* We are going to free the cursor and the prebuilt. Store
		the transaction handle locally. */
		trx = prebuilt->trx;
		err = ib_cursor_close(*ib_crsr);
		ut_a(err == DB_SUCCESS);

		*ib_crsr = NULL;

		/* A temp go around for assertion in trx_start_for_ddl_low
		we already start the trx */
		if (trx->state == TRX_STATE_ACTIVE) {
#ifdef UNIV_DEBUG
			trx->start_file = 0;
#endif /* UNIV_DEBUG */
			trx->dict_operation = TRX_DICT_OP_TABLE;
		}

		/* This function currently commits the transaction
		on success. */
		err = static_cast<ib_err_t>(
			row_truncate_table_for_mysql(table, trx));

		if (err == DB_SUCCESS) {
			*table_id = (table->id);
		}
	}

        return(err);
}

/*****************************************************************//**
Truncate a table.
@return DB_SUCCESS or error code */
ib_err_t
ib_table_truncate(
/*==============*/
	const char*	table_name,	/*!< in: table name */
	ib_id_u64_t*	table_id)	/*!< out: new table id */
{
	ib_err_t        err;
	dict_table_t*   table;
	ib_err_t        trunc_err;
	ib_trx_t        ib_trx = NULL;
	ib_crsr_t       ib_crsr = NULL;
	ib_ulint_t	memcached_sync = 0;

	ib_trx = ib_trx_begin(IB_TRX_SERIALIZABLE, true, false);

	dict_mutex_enter_for_mysql();

	table = dict_table_open_on_name(table_name, TRUE, FALSE,
					DICT_ERR_IGNORE_NONE);

	if (table != NULL && dict_table_get_first_index(table)) {
		err = ib_create_cursor_with_index_id(&ib_crsr, table, 0,
						     (trx_t*) ib_trx);
	} else {
		err = DB_TABLE_NOT_FOUND;
	}

	/* Remember the memcached_sync_count and set it to 0, so the
	truncate can be executed. */
	if (table != NULL && err == DB_SUCCESS) {
		memcached_sync = static_cast<ib_ulint_t>(
			table->memcached_sync_count);
		table->memcached_sync_count = 0;
	}

	dict_mutex_exit_for_mysql();

	if (err == DB_SUCCESS) {
		trunc_err = ib_cursor_truncate(&ib_crsr, table_id);
		ut_a(err == DB_SUCCESS);
	} else {
		trunc_err = err;
	}

	if (ib_crsr != NULL) {
		err = ib_cursor_close(ib_crsr);
		ut_a(err == DB_SUCCESS);
	}

	if (trunc_err == DB_SUCCESS) {
		ut_a(!trx_is_started(static_cast<trx_t*>(ib_trx)));
	} else {
		err = ib_trx_rollback(ib_trx);
		ut_a(err == DB_SUCCESS);
	}

	err = ib_trx_release(ib_trx);
	ut_a(err == DB_SUCCESS);

	/* Set the memcached_sync_count back. */
	if (table != NULL && memcached_sync != 0) {
		dict_mutex_enter_for_mysql();

		table->memcached_sync_count = memcached_sync;

		dict_mutex_exit_for_mysql();
	}

        return(trunc_err);
}

/*****************************************************************//**
Return isolation configuration set by "innodb_api_trx_level"
@return trx isolation level*/
ib_trx_level_t
ib_cfg_trx_level()
/*==============*/
{
	return(static_cast<ib_trx_level_t>(ib_trx_level_setting));
}

/*****************************************************************//**
Return configure value for background commit interval (in seconds)
@return background commit interval (in seconds) */
ib_ulint_t
ib_cfg_bk_commit_interval()
/*=======================*/
{
	return(static_cast<ib_ulint_t>(ib_bk_commit_interval));
}

/*****************************************************************//**
Get generic configure status
@return configure status*/
int
ib_cfg_get_cfg()
/*============*/
{
	int	cfg_status;

	cfg_status = (ib_binlog_enabled) ? IB_CFG_BINLOG_ENABLED : 0;

	if (ib_mdl_enabled) {
		cfg_status |= IB_CFG_MDL_ENABLED;
	}

	if (ib_disable_row_lock) {
		cfg_status |= IB_CFG_DISABLE_ROWLOCK;
	}

	return(cfg_status);
}

/*****************************************************************//**
Wrapper of ut_strerr() which converts an InnoDB error number to a
human readable text message.
@return string, describing the error */
const char*
ib_ut_strerr(
/*=========*/
	ib_err_t	num)	/*!< in: error number */
{
	return(ut_strerr(num));
}

/*****************************************************************//**
Increase/decrease the memcached sync count of table to sync memcached
DML with SQL DDLs.
@return DB_SUCCESS or error number */
ib_err_t
ib_cursor_set_memcached_sync(
/*=========================*/
	ib_crsr_t	ib_crsr,	/*!< in: cursor */
	ib_bool_t	flag)		/*!< in: true for increase */
{
	const ib_cursor_t*      cursor = (const ib_cursor_t*) ib_crsr;
	row_prebuilt_t*         prebuilt = cursor->prebuilt;
	dict_table_t*           table = prebuilt->table;
	ib_err_t                err = DB_SUCCESS;

	if (table != NULL) {
                /* If memcached_sync_count is -1, means table is
                doing DDL, we just return error. */
                if (table->memcached_sync_count == DICT_TABLE_IN_DDL) {
                        return(DB_ERROR);
                }

		if (flag) {
			os_atomic_increment_lint(&table->memcached_sync_count, 1);
		} else {
			os_atomic_decrement_lint(&table->memcached_sync_count, 1);
		        ut_a(table->memcached_sync_count >= 0);
		}
	} else {
		err = DB_TABLE_NOT_FOUND;
	}

	return(err);
}
