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SET sql_mode=ORACLE;
#
# MDEV-29095 REGEXP_REPLACE treats empty strings different than REPLACE in ORACLE mode
#
CREATE TABLE t1 (replacement VARCHAR(10));
INSERT INTO t1 VALUES (NULL), ('');
SELECT replacement, REGEXP_REPLACE('abba','a',replacement) FROM t1 ORDER BY replacement;
replacement REGEXP_REPLACE('abba','a',replacement)
NULL bb
bb
DROP TABLE t1;
SELECT REGEXP_REPLACE('abba','a',null);
REGEXP_REPLACE('abba','a',null)
bb
EXPLAIN EXTENDED SELECT REPLACE('abba','a',null) ;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select replace('abba','a',NULL) AS "REPLACE('abba','a',null)"
CREATE VIEW v1 AS SELECT REPLACE('abba','a',null) ;
SHOW CREATE VIEW v1;
View Create View character_set_client collation_connection
v1 CREATE VIEW "v1" AS select replace('abba','a',NULL) AS "REPLACE('abba','a',null)" latin1 latin1_swedish_ci
SELECT * FROM v1;
REPLACE('abba','a',null)
bb
SET sql_mode=DEFAULT;
SHOW CREATE VIEW v1;
View Create View character_set_client collation_connection
v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select oracle_schema.replace('abba','a',NULL) AS `REPLACE('abba','a',null)` latin1 latin1_swedish_ci
SELECT * FROM v1;
REPLACE('abba','a',null)
bb
DROP VIEW v1;
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