mariadb/mysql-test/t/delete_returning.test

#
#  Tests for DELETE FROM <table> ... RETURNING <expr>,...
# 
--disable_warnings
drop table if exists t1,t2;
drop view if exists v1;
drop procedure if exists p1;
--enable_warnings

CREATE TABLE t1 (a int, b varchar(32));
INSERT INTO t1 VALUES
  (7,'ggggggg'), (1,'a'), (3,'ccc'),
  (4,'dddd'), (1,'A'), (2,'BB'), (4,'DDDD'),
  (5,'EEEEE'), (7,'GGGGGGG'), (2,'bb');

CREATE TABLE t1c SELECT * FROM t1;

CREATE TABLE t2 (c int);
INSERT INTO t2 VALUES 
  (4), (5), (7), (1);

CREATE TABLE t2c SELECT * FROM t2;

CREATE VIEW v1 AS SELECT a, UPPER(b) FROM t1;

# DELETE FROM <table> ...  RETURNING *
 
DELETE FROM t1 WHERE a=2 RETURNING * ;
SELECT * FROM t1;

INSERT INTO t1 VALUES (2,'BB'), (2,'bb');

# DELETE FROM <table> ...  RETURNING <col>
 
DELETE FROM t1 WHERE a=2 RETURNING b;
SELECT * FROM t1;

# DELETE FROM <table> ...  RETURNING <not existing col>
--error ER_BAD_FIELD_ERROR
DELETE FROM t1 WHERE a=2 RETURNING c;
 
INSERT INTO t1 VALUES (2,'BB'), (2,'bb');

# DELETE FROM <table> ...  RETURNING <col>, <expr>

DELETE FROM t1 WHERE a=2 RETURNING a, UPPER(b);
SELECT * FROM t1;

INSERT INTO t1 VALUES (2,'BB'), (2,'bb');

# DELETE FROM <table> ...  RETURNING <col> with no rows to be deleted

DELETE FROM t1 WHERE a=6 RETURNING b;
SELECT * FROM t1;

# DELETE FROM <table> ... RETURNING <expr with aggr function>

--error ER_INVALID_GROUP_FUNC_USE
DELETE FROM t1 WHERE a=2 RETURNING MAX(b); 

# DELETE FROM <table> ...  RETURNING <expr with subquery>

DELETE FROM t1 WHERE a < 5 RETURNING a, (SELECT MIN(c) FROM t2 WHERE c=a+1);   
SELECT * FROM t1;

DELETE FROM t1;
INSERT INTO t1 SELECT * FROM t1c;

DELETE FROM t2 WHERE c < 5 
  RETURNING (SELECT GROUP_CONCAT(b) FROM t1 GROUP BY a HAVING a=c);
SELECT * FROM t2;

DELETE FROM t2;
INSERT INTO t2 SELECT * FROM t2c;

# DELETE FROM <table> ... RETURNING <expr with function invocation>

DELIMITER |;

CREATE FUNCTION f(arg INT) RETURNS TEXT
BEGIN
  RETURN (SELECT GROUP_CONCAT(b) FROM t1 WHERE a=arg);
END|

DELIMITER ;|

DELETE FROM t2 WHERE c < 5 RETURNING f(c);
SELECT * FROM t2;

DELETE FROM t2;
INSERT INTO t2 SELECT * FROM t2c;

DROP FUNCTION f;

# DELETE FROM <view> ...  RETURNING <col>, <col>

DELETE FROM v1 WHERE a < 5 RETURNING * ;
SELECT * FROM t1;
 
DELETE FROM t1;
INSERT INTO t1 SELECT * FROM t1c;

# DELETE FROM <view> ...  RETURNING <expr>

CREATE VIEW v11(a,c) AS SELECT a, COUNT(b) FROM t1 GROUP BY a;
-- error ER_NON_UPDATABLE_TABLE
DELETE FROM v11 WHERE a < 5 RETURNING * ;
DROP VIEW v11;

# prepared DELETE FROM <table> ... RETURNING <expr>

PREPARE stmt FROM 
"DELETE FROM t1 WHERE a=2 ORDER BY b LIMIT 1 RETURNING a, UPPER(b)";
EXECUTE stmt;
SELECT * FROM t1;
EXECUTE stmt;
SELECT * FROM t1;
DEALLOCATE PREPARE stmt;

# Cleanup
DROP VIEW v1;
DROP TABLE t1,t2;
DROP TABLE t1c,t2c;

--echo #
--echo # Bug mdev-4918: DELETE ... RETURNING subquery with more than 1 row
--echo #

CREATE TABLE t1 (i1 int);
INSERT INTO t1 VALUES (1),(2);

CREATE TABLE t2 (i2 int);
INSERT INTO t2 VALUES (1),(2);

--error ER_SUBQUERY_NO_1_ROW
DELETE FROM t1 ORDER BY i1 RETURNING ( SELECT i2 FROM t2 );

DROP TABLE t1,t2;

--echo #
--echo # MDEV-4919: Packets out of order on a SELECT after calling a procedure with DELETE .. RETURNING
--echo #
CREATE TABLE t1 (i INT);
INSERT INTO t1 VALUES (1),(2);
--delimiter |
CREATE PROCEDURE p1 (a INT) 
BEGIN
  DELETE FROM t1 WHERE i = a RETURNING *;
  INSERT INTO t1 VALUES (a);
END |
--delimiter ;

CALL p1(1);
SELECT * FROM t1;
DROP PROCEDURE p1;
DROP TABLE t1;