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MDEV-17781: Server crashes in next_linear_tab

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For degenerate joins we may have JOIN::table_list as NULL, so instead
of using JOIN::top_join_tab_count use the function JOIN::exec_join_tab_cnt
to get the number of tables joined at the top level.
This commit is contained in:
Varun Gupta
2019-05-03 09:35:47 +05:30
parent ce195987c3
commit e292c67bb2
3 changed files with 33 additions and 1 deletions
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14
mysql-test/t/win.test
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@ -2265,6 +2265,20 @@ insert into t1 values (1),(2),(3);
SELECT rank() OVER (ORDER BY 1), ROW_NUMBER() OVER (ORDER BY (EXPORT_SET(5,'Y','N',',',4))) FROM t1;
drop table t1;
--echo #
--echo # MDEV-17781: Server crashes in next_linear_tab
--echo #
CREATE TABLE t1 (i1 int);
explain
(SELECT AVG(0) OVER (), MAX('2') FROM t1)
UNION ALL
(SELECT AVG(0) OVER (), MAX('2') FROM t1);
(SELECT AVG(0) OVER (), MAX('2') FROM t1)
UNION ALL
(SELECT AVG(0) OVER (), MAX('2') FROM t1);
drop table t1;
--echo #
--echo # End of 10.2 tests
--echo #