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MDEV-13723: Server crashes in ha_heap::find_unique_row or Assertion `0' failed in st_select_lex_unit::optimize with INTERSECT

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With INTERSECT/EXCEPT fact that subquery item of IN/ALL/ANY was not assigned value does not mean that temporary table used for calculating unit is empty (records could be deleted).
This commit is contained in:
Oleksandr Byelkin
2017-11-13 09:41:29 +01:00
parent 386e5d476e
commit d2bf101cbf
5 changed files with 31 additions and 5 deletions
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10
sql/sql_union.cc
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@ -1299,11 +1299,11 @@ bool st_select_lex_unit::optimize()
{
item->assigned(0); // We will reinit & rexecute unit
item->reset();
if (table->is_created())
{
table->file->ha_delete_all_rows();
table->file->info(HA_STATUS_VARIABLE);
}
}
if (table->is_created())
{
table->file->ha_delete_all_rows();
table->file->info(HA_STATUS_VARIABLE);
}
/* re-enabling indexes for next subselect iteration */
if (union_distinct && table->file->ha_enable_indexes(HA_KEY_SWITCH_ALL))