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Bug #22457: Column alias in ORDER BY works, but not if in an expression

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The parser is allocating Item_field for references by name in ORDER BY
 expressions. Such expressions however may point not only to Item_field 
 in the select list (or to a table column) but also to an arbitrary Item. 
 This causes Item_field::fix_fields to throw an error about missing 
 column.
 The fix substitutes Item_field for the reference with an Item_ref when 
 not pointing to Item_field.


mysql-test/r/order_by.result:
  Bug #22457: Column alias in ORDER BY works, but not if in an expression
   - test case
mysql-test/t/order_by.test:
  Bug #22457: Column alias in ORDER BY works, but not if in an expression
   - test case
sql/item.cc:
  Bug #22457: Column alias in ORDER BY works, but not if in an expression
   - transform the Item_field made by the parser into Item_ref if it 
     doesn't point to Item_field and it is in allowed context
This commit is contained in:
unknown
2006-11-03 18:48:16 +02:00
parent 5701d8eea5
commit c095f98ff7
3 changed files with 73 additions and 3 deletions
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27
mysql-test/r/order_by.result
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@ -820,3 +820,30 @@ b a
20 1
10 2
DROP TABLE t1;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
SELECT a + 1 AS num FROM t1 ORDER BY 30 - num;
num
3
2
SELECT CONCAT('test', a) AS str FROM t1 ORDER BY UPPER(str);
str
test1
test2
SELECT a + 1 AS num FROM t1 GROUP BY 30 - num;
num
3
2
SELECT a + 1 AS num FROM t1 HAVING 30 - num;
num
2
3
SELECT a + 1 AS num, num + 1 FROM t1;
ERROR 42S22: Unknown column 'num' in 'field list'
SELECT a + 1 AS num, (select num + 2 FROM t1 LIMIT 1) FROM t1;
num (select num + 2 FROM t1 LIMIT 1)
2 4
3 5
SELECT a.a + 1 AS num FROM t1 a JOIN t1 b ON num = b.a;
ERROR 42S22: Unknown column 'num' in 'on clause'
DROP TABLE t1;