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Manual merge of mysql-5.1-bugteam into mysql-trunk-merge.

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Text conflict in .bzr-mysql/default.conf
Text conflict in mysql-test/suite/rpl/r/rpl_slow_query_log.result
Text conflict in mysql-test/suite/rpl/t/rpl_slow_query_log.test
Conflict adding files to server-tools.  Created directory.
Conflict because server-tools is not versioned, but has versioned children.  Versioned directory.
Conflict adding files to server-tools/instance-manager.  Created directory.
Conflict because server-tools/instance-manager is not versioned, but has versioned children.  Versioned directory.
Contents conflict in server-tools/instance-manager/options.cc
Text conflict in sql/mysqld.cc
This commit is contained in:
Alexey Kopytov
2010-02-09 12:59:38 +05:00
parent a93d838a12 29b7338736
commit 017c969896
37 changed files with 958 additions and 270 deletions
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20
sql/sql_select.h
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@ -361,7 +361,25 @@ public:
*/
bool no_const_tables;
JOIN *tmp_join; ///< copy of this JOIN to be used with temporary tables
/**
Copy of this JOIN to be used with temporary tables.
tmp_join is used when the JOIN needs to be "reusable" (e.g. in a subquery
that gets re-executed several times) and we know will use temporary tables
for materialization. The materialization to a temporary table overwrites the
JOIN structure to point to the temporary table after the materialization is
done. This is where tmp_join is used : it's a copy of the JOIN before the
materialization and is used in restoring before re-execution by overwriting
the current JOIN structure with the saved copy.
Because of this we should pay extra care of not freeing up helper structures
that are referenced by the original contents of the JOIN. We can check for
this by making sure the "current" join is not the temporary copy, e.g.
!tmp_join || tmp_join != join
We should free these sub-structures at JOIN::destroy() if the "current" join
has a copy is not that copy.
*/
JOIN *tmp_join;
ROLLUP rollup; ///< Used with rollup
bool select_distinct; ///< Set if SELECT DISTINCT