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MDEV-38099: Assertion failed in st_select_lex::optimize_unflattened_s… #4538

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MDEV-38099: Assertion failed in st_select_lex::optimize_unflattened_s… #4538

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8 changes: 8 additions & 0 deletions mysql-test/main/cte_nonrecursive.result
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Original file line number Diff line number Diff line change
Expand Up @@ -2683,3 +2683,11 @@ cte as (select t1.a as t1a, t2.a as t2a from t as t1, t as t2 where t1.a=t2.a)
select * from cte;
ERROR 42S02: Table 'test.t' doesn't exist
# End of 10.4 tests
#
# Start of 12.2 tests
#
#
# MDEV-38099: Assertion failed in st_select_lex::optimize_unflattened_subqueries
#
SELECT (WITH cte AS (SELECT RAND()) SELECT * FROM cte);
# End of 12.2 tests
13 changes: 13 additions & 0 deletions mysql-test/main/cte_nonrecursive.test
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Expand Up @@ -2026,3 +2026,16 @@ drop table t,s;
eval $q1;

--echo # End of 10.4 tests

--echo #
--echo # Start of 12.2 tests
--echo #

--echo #
--echo # MDEV-38099: Assertion failed in st_select_lex::optimize_unflattened_subqueries
--echo #
--disable_result_log
SELECT (WITH cte AS (SELECT RAND()) SELECT * FROM cte);
--enable_result_log

--echo # End of 12.2 tests
2 changes: 2 additions & 0 deletions sql/sql_lex.cc
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Expand Up @@ -11130,6 +11130,8 @@ void st_select_lex::register_unit(SELECT_LEX_UNIT *unit,
slave= unit;
unit->master= this;
uncacheable|= unit->uncacheable;
if (master && (unit->uncacheable & UNCACHEABLE_RAND))
master->uncacheable|= UNCACHEABLE_RAND;

for(SELECT_LEX *sel= unit->first_select();sel; sel= sel->next_select())
{
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