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MDEV-33988 DELETE single table to support table aliases

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Gain MySQL compatibility by allowing table aliases in a single
table statement.

This now supports the syntax of:

DELETE [delete_opts] FROM tbl_name [[AS] tbl_alias] [PARTITION (partition_name [, partition_name] ...)] ....

The delete.test is from MySQL commit 1a72b69778a9791be44525501960b08856833b8d
/ Change-Id: Iac3a2b5ed993f65b7f91acdfd60013c2344db5c0.

Co-Author: Gleb Shchepa <gleb.shchepa@oracle.com> (for delete.test)

Reviewed by Igor Babaev (igor@mariadb.com)
This commit is contained in:
Daniel Black
2024-05-01 12:51:53 +10:00
parent 0cd20e3aaf
commit 75d354a23a
8 changed files with 241 additions and 12 deletions
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47
mysql-test/main/delete_use_source.test
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@ -257,3 +257,50 @@ select * from t2;
deallocate prepare stmt;
drop table t1,t2;
--echo # End of 11.1
--echo #
--echo # MDEV-33988 DELETE (single table) to support table aliases
--echo #
create table t1 (c1 int, c2 int, c3 int);
insert into t1 values
(1,1,1), (1,2,2), (1,3,3), (2,1,4), (2,2,5), (2,3,6), (2,5,7), (3,5,8);
create table t2 (id int auto_increment primary key, a int, key(a));
insert into t2(a) values (3), (5), (-1);
--echo # 1. The alias in delete coincides with the table name in IN subquery.
explain extended
delete from t1 t2 where t2.c1 in (select a from t2);
delete from t1 t2 where t2.c1 in (select a from t2);
select * from t1;
--echo # 2. The alias in delete is different from the alias in IN subquery
explain extended
delete from t1 t_x where t_x.c2 IN (select a from t2 as t_y);
delete from t1 t_x where t_x.c2 IN (select a from t2 as t_y);
select * from t1;
--echo # 3. The alias in delete is the same as the alias in IN subquery.
explain extended
delete from t1 as t_x where t_x.c3 IN (select a from t2 t_x);
delete from t1 as t_x where t_x.c3 IN (select a from t2 t_x);
select * from t1;
--echo # 4. The table in delete is the alias in IN subquery
explain extended
delete from t1 t2 where t2.c1 IN (select a -1 from t2 as t1);
delete from t1 t2 where t2.c1 IN (select a -1 from t2 as t1);
select * from t1;
drop table t1, t2;
--echo # End of 11.6