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MDEV-16722: Assertion `type() != NULL_ITEM' failed

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We hit this assert during the create of a temporary table field
because the current code does not handle the case when the value
of the NAME_CONST function is NULL.
Fixed this by allowing creation of temporary table fields even
for the case when NAME_CONST returns NULL value.
Introduced tmp_table_field_from_field_type_maybe_null() function
in Item class so both Item_basic_value and Item_name_const can use it.
Introduced a virtual method get_func_item() in the Item class.
This commit is contained in:
Varun Gupta
2018-08-12 12:08:11 +05:30
parent b05ee14d95
commit befc09f002
7 changed files with 67 additions and 53 deletions
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9
mysql-test/main/win.test
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@@ -2100,3 +2100,12 @@ CREATE TABLE t1 (d time);
INSERT INTO t1 VALUES ('00:00:01'),('00:00:02');
SELECT *, LEAD(d) OVER (ORDER BY d) AS x FROM t1;
DROP TABLE t1;
--echo #
--echo # MDEV-16722: Assertion `type() != NULL_ITEM' failed
--echo #
create table t1 (a int);
insert into t1 values (1),(2),(3);
SELECT row_number() OVER (order by a) FROM t1 order by NAME_CONST('myname',NULL);
drop table t1;