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Fixed mdev-6706 Wrong result (missing rows)

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with joins, SQ, ORDER BY, semijoin=on

A bug in get_sort_by_table() could mislead the function
setup_semijoin_dups_elimination(). As a result the optimizer
could produce invalid execution plans for queries with ORDER BY
and subquery predicates that could be converted to semi-joins.
This commit is contained in:
Igor Babaev
2018-01-12 00:14:40 -08:00
parent 6293e3bbcf
commit abc123391f
3 changed files with 85 additions and 0 deletions
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sql/sql_select.cc
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@ -21159,6 +21159,7 @@ get_sort_by_table(ORDER *a,ORDER *b, List<TABLE_LIST> &tables,
if (!map || (map & (RAND_TABLE_BIT | OUTER_REF_TABLE_BIT)))
DBUG_RETURN(0);
map&= ~const_tables;
while ((table= ti++) && !(map & table->table->map)) ;
if (map != table->table->map)
DBUG_RETURN(0); // More than one table