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MDEV-16990:server crashes in base_list_iterator::next

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When we have a query which has implicit_grouping then we are sure that we would end up with only one
row so there is no point to do DISTINCT computation
This commit is contained in:
Varun Gupta
2018-10-14 10:44:00 -07:00
parent b715a0fe45
commit af6077b535
3 changed files with 23 additions and 1 deletions
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12
mysql-test/r/win.result
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@@ -3314,3 +3314,15 @@ COUNT(DISTINCT t2.a2) rank() OVER (ORDER BY t2.b1)
1 2
1 3
DROP TABLE t1,t2;
#
# MDEV-16990: server crashes in base_list_iterator::next
#
CREATE TABLE t1(i int);
insert into t1 values (1),(2);
SELECT DISTINCT row_number() OVER (), MAX(1) FROM t1;
row_number() OVER () MAX(1)
1 1
SELECT DISTINCT BIT_AND(0) OVER (), MAX(1) FROM t1;
BIT_AND(0) OVER () MAX(1)
0 1
drop table t1;

10
mysql-test/t/win.test
View File

@@ -2082,3 +2082,13 @@ SELECT COUNT(DISTINCT t2.a2),
rank() OVER (ORDER BY t2.b1)
FROM t2 ,t1 GROUP BY t2.b1 ORDER BY t1.a1;
DROP TABLE t1,t2;
--echo #
--echo # MDEV-16990: server crashes in base_list_iterator::next
--echo #
CREATE TABLE t1(i int);
insert into t1 values (1),(2);
SELECT DISTINCT row_number() OVER (), MAX(1) FROM t1;
SELECT DISTINCT BIT_AND(0) OVER (), MAX(1) FROM t1;
drop table t1;

2
sql/sql_select.cc
View File

@@ -2731,7 +2731,7 @@ bool JOIN::make_aggr_tables_info()
remove_duplicates() assumes there is a preceding computation step (and
in the degenerate join, there's none)
*/
if (top_join_tab_count)
if (top_join_tab_count && tables_list)
curr_tab->distinct= true;
having= NULL;