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MDEV-29095 REGEXP_REPLACE treats empty strings different than REPLACE in ORACLE mode

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Turning REGEXP_REPLACE into two schema-qualified functions:
- mariadb_schema.regexp_replace()
- oracle_schema.regexp_replace()

Fixing oracle_schema.regexp_replace(subj,pattern,replacement) to treat
NULL in "replacement" as an empty string.

Adding new classes implementing oracle_schema.regexp_replace():
- Item_func_regexp_replace_oracle
- Create_func_regexp_replace_oracle

Adding helper methods:
- String *Item::val_str_null_to_empty(String *to)
- String *Item::val_str_null_to_empty(String *to, bool null_to_empty)

and reusing these methods in both Item_func_replace and
Item_func_regexp_replace.
This commit is contained in:
Alexander Barkov
2023-11-24 13:23:56 +04:00
parent 3699a7e1a9
commit f738cc9876
8 changed files with 230 additions and 35 deletions
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26
mysql-test/suite/compat/oracle/t/func_regexp_replace.test Normal file
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SET sql_mode=ORACLE;
--echo #
--echo # MDEV-29095 REGEXP_REPLACE treats empty strings different than REPLACE in ORACLE mode
--echo #
#SELECT REGEXP_REPLACE(null,'a','b') ;
#SELECT REGEXP_REPLACE('ab',null,'b') ;
#SELECT REGEXP_REPLACE('ab','a',null) ;
#SELECT REGEXP_REPLACE('ab',null,null) ;
CREATE TABLE t1 (replacement VARCHAR(10));
INSERT INTO t1 VALUES (NULL), ('');
SELECT replacement, REGEXP_REPLACE('abba','a',replacement) FROM t1 ORDER BY replacement;
DROP TABLE t1;
SELECT REGEXP_REPLACE('abba','a',null);
EXPLAIN EXTENDED SELECT REPLACE('abba','a',null) ;
CREATE VIEW v1 AS SELECT REPLACE('abba','a',null) ;
SHOW CREATE VIEW v1;
SELECT * FROM v1;
SET sql_mode=DEFAULT;
SHOW CREATE VIEW v1;
SELECT * FROM v1;
DROP VIEW v1;