BUG#25106: A USING clause in combination with a VIEW results in column

           aliases ignored
When a column reference to a column in JOIN USING is resolved and a new 
Item is created for this column the user defined name was lost.
This fix preserves the alias by setting the name of the new Item to the
original alias.
parent a63df24a
......@@ -764,3 +764,19 @@ natural join t5;
y c b a z
1 3 2 1 4
drop table t1, t2, t3, t4, t5;
CREATE TABLE t1 (ID INTEGER, Name VARCHAR(50));
CREATE TABLE t2 (Test_ID INTEGER);
CREATE VIEW v1 (Test_ID, Description) AS SELECT ID, Name FROM t1;
CREATE TABLE tv1 SELECT Description AS Name FROM v1 JOIN t2
USING (Test_ID);
DESCRIBE tv1;
Field Type Null Key Default Extra
Name varchar(50) YES NULL
CREATE TABLE tv2 SELECT Description AS Name FROM v1 JOIN t2
ON v1.Test_ID = t2.Test_ID;
DESCRIBE tv2;
Field Type Null Key Default Extra
Name varchar(50) YES NULL
DROP VIEW v1;
DROP TABLE t1,t2,tv1,tv2;
End of 5.0 tests.
......@@ -591,3 +591,23 @@ select * from ((t3 natural join (t1 natural join t2)) natural join t4)
drop table t1, t2, t3, t4, t5;
# End of tests for WL#2486 - natural/using join
#
# BUG#25106: A USING clause in combination with a VIEW results in column
# aliases ignored
#
CREATE TABLE t1 (ID INTEGER, Name VARCHAR(50));
CREATE TABLE t2 (Test_ID INTEGER);
CREATE VIEW v1 (Test_ID, Description) AS SELECT ID, Name FROM t1;
CREATE TABLE tv1 SELECT Description AS Name FROM v1 JOIN t2
USING (Test_ID);
DESCRIBE tv1;
CREATE TABLE tv2 SELECT Description AS Name FROM v1 JOIN t2
ON v1.Test_ID = t2.Test_ID;
DESCRIBE tv2;
DROP VIEW v1;
DROP TABLE t1,t2,tv1,tv2;
--echo End of 5.0 tests.
......@@ -2977,6 +2977,19 @@ find_field_in_natural_join(THD *thd, TABLE_LIST *table_ref, const char *name,
column reference. See create_view_field() for details.
*/
item= nj_col->create_item(thd);
/*
*ref != NULL means that *ref contains the item that we need to
replace. If the item was aliased by the user, set the alias to
the replacing item.
We need to set alias on both ref itself and on ref real item.
*/
if (*ref && !(*ref)->is_autogenerated_name)
{
item->set_name((*ref)->name, (*ref)->name_length,
system_charset_info);
item->real_item()->set_name((*ref)->name, (*ref)->name_length,
system_charset_info);
}
if (register_tree_change && arena)
thd->restore_active_arena(arena, &backup);
......
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