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| author | Martin Hansson <martin.hansson@sun.com> | 2010-06-24 15:21:23 +0200 |
|---|---|---|
| committer | Martin Hansson <martin.hansson@sun.com> | 2010-06-24 15:21:23 +0200 |
| commit | 2b734bbee9aeb98a64a5b59808f56342819053a7 (patch) | |
| tree | 2021a4b16d7dd8402d35c567685bc77fcdd32115 /sql/opt_range.h | |
| parent | f4420a3b90e57c68cc72606b4ecb240266260861 (diff) | |
| download | mariadb-git-2b734bbee9aeb98a64a5b59808f56342819053a7.tar.gz | |
Bug#41660: Sort-index_merge for non-first join table may
require O(#scans) memory
When an index merge operation was restarted, it would
re-allocate the Unique object controlling the duplicate row
ID elimination. Fixed by making the Unique object a member
of QUICK_INDEX_MERGE_SELECT and thus reusing it throughout
the lifetime of this object.
Diffstat (limited to 'sql/opt_range.h')
| -rw-r--r-- | sql/opt_range.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sql/opt_range.h b/sql/opt_range.h index e7d8297faf8..edae1e4114a 100644 --- a/sql/opt_range.h +++ b/sql/opt_range.h @@ -500,6 +500,7 @@ public: class QUICK_INDEX_MERGE_SELECT : public QUICK_SELECT_I { + Unique *unique; public: QUICK_INDEX_MERGE_SELECT(THD *thd, TABLE *table); ~QUICK_INDEX_MERGE_SELECT(); @@ -684,7 +685,7 @@ private: class QUICK_GROUP_MIN_MAX_SELECT : public QUICK_SELECT_I { private: - handler *file; /* The handler used to get data. */ + handler * const file; /* The handler used to get data. */ JOIN *join; /* Descriptor of the current query */ KEY *index_info; /* The index chosen for data access */ uchar *record; /* Buffer where the next record is returned. */ |