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Fixed bug mdev-12375.

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The function st_select_lex_unit::exec_recursive() incorrectly determined
that a CTE mutually recursive with some others was stabilized in the case
when the non-recursive part of the CTE returned an empty set. As a result
the server fell into an infinite loop when executing a query using
this CTE.
This commit is contained in:
Igor Babaev
2017-03-27 14:41:17 -07:00
parent 046d442d4c
commit 93dd70ced8
3 changed files with 126 additions and 2 deletions
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2
sql/sql_union.cc
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@ -1247,7 +1247,7 @@ bool st_select_lex_unit::exec_recursive()
thd->inc_examined_row_count(examined_rows);
incr_table->file->info(HA_STATUS_VARIABLE);
if (incr_table->file->stats.records == 0)
if (with_element->level && incr_table->file->stats.records == 0)
with_element->set_as_stabilized();
else
with_element->level++;