Details
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Bug
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Status: Open (View Workflow)
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Major
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Resolution: Unresolved
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10.3(EOL), 10.4(EOL), 10.5, 10.6, 10.7(EOL), 10.8(EOL), 10.9(EOL), 10.10(EOL), 10.11
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None
Description
If an unresolvalble column reference occurs in ORDER BY clause of an union contained in an EXISTs subquery of in the left part of a subquery predicand then it is ignored and no error message is reported.
Here is a test case demonstrating the problem:
create table t1 (a int, b int); |
insert into t1 values (3,8), (7,2), (1,4), (5,9); |
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create table t2 (a int, b int); |
insert into t2 values (9,1), (7,3), (2,6); |
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create table t3 (c int, d int); |
insert into t3 values (7,8), (1,2), (3,8), (9,1); |
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select * from t3 as t |
where |
(t.c,t.d) in |
(
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select a,b from t1 where t1.a > 3 |
union |
select a,b from t2 where t2.b < 6 |
order by (a - b/x) |
)
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;
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drop table t1,t2,t3; |
When executing the above query we have
MariaDB [test]> select * from t3 as t
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-> where
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-> (t.c,t.d) in
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-> (
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-> select a,b from t1 where t1.a > 3
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-> union
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-> select a,b from t2 where t2.b < 6
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-> order by (a - b/x)
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-> )
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-> ;
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+------+------+
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| c | d |
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+------+------+
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| 9 | 1 |
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+------+------+
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However the same error message as from the query
select a,b from t1 where t1.a > 3 |
union |
select a,b from t2 where t2.b < 6 |
order by (a - b/x) |
is expected
MariaDB [test]> select a,b from t1 where t1.a > 3
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-> union
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-> select a,b from t2 where t2.b < 6
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-> order by (a - b/x)
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-> ;
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ERROR 1054 (42S22): Unknown column 'x' in 'order clause'
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