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Fix Bug#30423 "InnoDBs treatment of NULL in index stats causes bad

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"rows examined" estimates". This change implements "innodb_stats_method"
with options of "nulls_equal", "nulls_unequal" and "null_ignored".
      
rb://553 approved by Marko
This commit is contained in:
Jimmy Yang
2011-01-14 09:02:28 -08:00
parent 634fe86056
commit 9cd4d49840
25 changed files with 1157 additions and 77 deletions
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18
storage/innodb_plugin/include/srv0srv.h
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@ -154,6 +154,11 @@ capacity. PCT_IO(5) -> returns the number of IO operations that
is 5% of the max where max is srv_io_capacity. */
#define PCT_IO(p) ((ulong) (srv_io_capacity * ((double) p / 100.0)))
/* The "innodb_stats_method" setting, decides how InnoDB is going
to treat NULL value when collecting statistics. It is not defined
as enum type because the configure option takes unsigned integer type. */
extern ulong srv_innodb_stats_method;
#ifdef UNIV_LOG_ARCHIVE
extern ibool srv_log_archive_on;
extern ibool srv_archive_recovery;
@ -363,6 +368,19 @@ enum {
in connection with recovery */
};
/* Alternatives for srv_innodb_stats_method, which could be changed by
setting innodb_stats_method */
enum srv_stats_method_name_enum {
SRV_STATS_NULLS_EQUAL, /* All NULL values are treated as
equal. This is the default setting
for innodb_stats_method */
SRV_STATS_NULLS_UNEQUAL, /* All NULL values are treated as
NOT equal. */
SRV_STATS_NULLS_IGNORED /* NULL values are ignored */
};
typedef enum srv_stats_method_name_enum srv_stats_method_name_t;
#ifndef UNIV_HOTBACKUP
/** Types of threads existing in the system. */
enum srv_thread_type {