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Added the type of histogram for mwl #253.

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Introduced double precision height-balanced histograms.
This commit is contained in:
Igor Babaev
2013-03-30 18:57:07 -07:00
parent e59e529635
commit 9e1ca1053b
15 changed files with 695 additions and 265 deletions
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mysql-test/r/system_mysql_db.result
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@ -287,6 +287,7 @@ column_stats CREATE TABLE `column_stats` (
`avg_length` decimal(12,4) DEFAULT NULL,
`avg_frequency` decimal(12,4) DEFAULT NULL,
`hist_size` tinyint(3) unsigned DEFAULT NULL,
`hist_type` enum('SINGLE_PREC_HB','DOUBLE_PREC_HB') COLLATE utf8_bin 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'