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| author | timour@askmonty.org <timour@askmonty.org> | 2013-10-18 11:45:25 +0300 |
|---|---|---|
| committer | timour@askmonty.org <timour@askmonty.org> | 2013-10-18 11:45:25 +0300 |
| commit | afed809297ec43d7825b607b6ebadbabe4f63c2a (patch) | |
| tree | f1d181866a058711fd214f566cc8eb56dc2e2b6f /sql/sql_select.h | |
| parent | adbb4393586d46257a7d483212748df66261dca8 (diff) | |
| download | mariadb-git-afed809297ec43d7825b607b6ebadbabe4f63c2a.tar.gz | |
MDEV-5123 Remove duplicated conditions pushed both to join_tab->select_cond and join_tab->cache_select->cond for blocked joins.
BNL and BNLH joins pre-filter the records from a joined table via JOIN_TAB::cache_select->cond.
There is no need to re-evaluate the same conditions via JOIN_TAB::select_cond. This patch removes
the duplicated conditions from the top-level conjuncts of each pushed condition.
The added "Using where" in few EXPLAINs is due to taking into account tab->cache_select->cond
in addition to tab->select_cond in JOIN::save_explain_data_intern.
Diffstat (limited to 'sql/sql_select.h')
| -rw-r--r-- | sql/sql_select.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sql/sql_select.h b/sql/sql_select.h index d4da44756c7..509e5ba67a6 100644 --- a/sql/sql_select.h +++ b/sql/sql_select.h @@ -544,6 +544,7 @@ typedef struct st_join_table { !(used_sjm_lookup_tables & ~emb_sj_nest->sj_inner_tables)); } + void remove_redundant_bnl_scan_conds(); } JOIN_TAB; |