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MDEV-13118 Wrong results with LOWER and UPPER and subquery
This problem is similar to MDEV-10306. 1. Fixing Item_str_conv::val_str(String *str) to return the result in "str", and to use tmp_value only as a temporary buffer for args[0]->val_str(). The new code version now guarantees that the result is always returned in "str". The trick with copy_if_not_alloced() is not used any more. 2. The change #1 revealed the same problem in SUBSTRING_INDEX(), so some tests with combinations of UPPER()/LOWER() and SUBSTRING_INDEX() started to fail. Fixing Item_func_substr_index::val_str() the same way, to return the result in "str" and use tmp_value as a temporary buffer for args[0]->val_str().
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,15 @@ | ||
--echo # | ||
--echo # MDEV-13118 Wrong results with LOWER and UPPER and subquery | ||
--echo # | ||
|
||
SET @save_optimizer_switch=@@optimizer_switch; | ||
SET optimizer_switch=_latin1'derived_merge=on'; | ||
CREATE TABLE t1 AS SELECT REPEAT('a', 10) AS t LIMIT 0; | ||
SHOW CREATE TABLE t1; | ||
INSERT INTO t1 VALUES ('abcdefghi'),('ABCDEFGHI'); | ||
--sorted_result | ||
SELECT CONCAT(t2,'-',t2) c2 FROM (SELECT LOWER(t) t2 FROM t1) sub; | ||
--sorted_result | ||
SELECT CONCAT(t2,'-',t2) c2 FROM (SELECT UPPER(t) t2 FROM t1) sub; | ||
DROP TABLE t1; | ||
SET optimizer_switch=@save_optimizer_switch; |
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