Temporary commit of merge of MariaDB 10.0-base and MySQL 5.6

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+/*****************************************************************************
+
+Copyright (c) 2009, 2010, Oracle and/or its affiliates. All Rights Reserved.
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; version 2 of the License.
+
+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 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 include/dict0stats.h
+Code used for calculating and manipulating table statistics.
+
+Created Jan 06, 2010 Vasil Dimov
+*******************************************************/
+
+#ifndef dict0stats_h
+#define dict0stats_h
+
+#include "univ.i"
+
+#include "db0err.h"
+#include "dict0types.h"
+#include "trx0types.h"
+
+enum dict_stats_upd_option {
+	DICT_STATS_RECALC_PERSISTENT,/* (re) calculate the
+				statistics using a precise and slow
+				algo and save them to the persistent
+				storage, if the persistent storage is
+				not present then emit a warning and
+				fall back to transient stats */
+	DICT_STATS_RECALC_PERSISTENT_SILENT,/* same as
+				DICT_STATS_RECALC_PERSISTENT
+				but do not emit a warning */
+	DICT_STATS_RECALC_TRANSIENT,/* (re) calculate the statistics
+				using an imprecise quick algo
+				without saving the results
+				persistently */
+	DICT_STATS_FETCH,	/* fetch the statistics from the
+				persistent storage */
+	DICT_STATS_FETCH_ONLY_IF_NOT_IN_MEMORY /* only fetch the stats
+				from the persistent storage if the in-memory
+				structures have not been initialized yet,
+				otherwise do nothing */
+};
+
+typedef enum dict_stats_upd_option	dict_stats_upd_option_t;
+
+/*********************************************************************//**
+Calculates new estimates for table and index statistics. The statistics
+are used in query optimization.
+@return DB_* error code or DB_SUCCESS */
+UNIV_INTERN
+enum db_err
+dict_stats_update(
+/*==============*/
+	dict_table_t*		table,	/*!< in/out: table */
+	dict_stats_upd_option_t	stats_upd_option,
+					/*!< in: whether to (re) calc
+					the stats or to fetch them from
+					the persistent storage */
+	ibool			caller_has_dict_sys_mutex);
+					/*!< in: TRUE if the caller
+					owns dict_sys->mutex */
+
+/*********************************************************************//**
+Removes the information for a particular index's stats from the persistent
+storage if it exists and if there is data stored for this index.
+The transaction is not committed, it must not be committed in this
+function because this is the user trx that is running DROP INDEX.
+The transaction will be committed at the very end when dropping an
+index.
+@return DB_SUCCESS or error code */
+UNIV_INTERN
+enum db_err
+dict_stats_delete_index_stats(
+/*==========================*/
+	dict_index_t*	index,	/*!< in: index */
+	trx_t*		trx,	/*!< in: transaction to use */
+	char*		errstr, /*!< out: error message if != DB_SUCCESS
+				is returned */
+	ulint		errstr_sz);/*!< in: size of the errstr buffer */
+
+/*********************************************************************//**
+Removes the statistics for a table and all of its indexes from the
+persistent storage if it exists and if there is data stored for the table.
+This function creates its own transaction and commits it.
+@return DB_SUCCESS or error code */
+UNIV_INTERN
+enum db_err
+dict_stats_delete_table_stats(
+/*==========================*/
+	const char*	table_name,	/*!< in: table name */
+	char*		errstr,		/*!< out: error message
+					if != DB_SUCCESS is returned */
+	ulint		errstr_sz);	/*!< in: size of errstr buffer */
+
+#endif /* dict0stats_h */