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Added histogams for table columns.

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Igor Babaev
2013-03-25 23:48:29 -07:00
parent fc1c8ffdad
commit 1009832c13
23 changed files with 1328 additions and 339 deletions
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mysql-test/r/system_mysql_db.result
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@ -286,6 +286,8 @@ column_stats CREATE TABLE `column_stats` (
`nulls_ratio` decimal(12,4) DEFAULT NULL,
`avg_length` decimal(12,4) DEFAULT NULL,
`avg_frequency` decimal(12,4) DEFAULT NULL,
`hist_size` tinyint(3) unsigned DEFAULT NULL,
`histogram` varbinary(255) DEFAULT NULL,
PRIMARY KEY (`db_name`,`table_name`,`column_name`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='Statistics on Columns'
show create table index_stats;