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MDEV-7474: Semi-Join's DuplicateWeedout strategy skipped ...

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JOIN::cur_dups_producing_tables was not maintained correctly in
the cases of greedy optimization (search_depth < n_tables).

Moved it to POSITION structure where it will be maintained automatically.

Removed POSITION::prefix_dups_producing_tables since its value can now
be calculated.
This commit is contained in:
Sergei Petrunia
2015-03-17 13:26:33 +03:00
parent 5a3bf84468
commit c020d362b6
8 changed files with 341 additions and 16 deletions
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sql/sql_select.cc
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@ -6143,7 +6143,6 @@ choose_plan(JOIN *join, table_map join_tables)
DBUG_ENTER("choose_plan");
join->cur_embedding_map= 0;
join->cur_dups_producing_tables= 0;
reset_nj_counters(join, join->join_list);
qsort2_cmp jtab_sort_func;