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Posted to issues-all@impala.apache.org by "Daniel Becker (Jira)" <ji...@apache.org> on 2025/03/18 17:13:00 UTC
[jira] [Commented] (IMPALA-13873) Missing equivalence conjunct in aggregation node with inline views
[ https://issues.apache.org/jira/browse/IMPALA-13873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17936574#comment-17936574 ]
Daniel Becker commented on IMPALA-13873:
----------------------------------------
More reduced versions that also produce the error:
{code:java}
select t.* from
(select
a,
b,
min(b) over (partition by a) min_b
from
(
select
10 a,
10 b
) u1
union
select 10, 10, 20) t
where t.b = t.min_b;{code}
{code:java}
WITH u1 AS (select 10 a, 10 b),
t AS (select a, b, min(b) over (partition by a) min_b from u1 UNION select 10, 10, 20)
select t.* from t where t.b = t.min_b;{code}
> Missing equivalence conjunct in aggregation node with inline views
> ------------------------------------------------------------------
>
> Key: IMPALA-13873
> URL: https://issues.apache.org/jira/browse/IMPALA-13873
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Affects Versions: Impala 4.5.0
> Reporter: Peter Rozsa
> Priority: Major
>
> The following query yields incorrect results:
> select t.* from
> (select
> a,
> b,
> min(b) over (partition by a) min_b
> from
> (
> select
> 10 a,
> 10 b
> union
> select
> 10 a,
> 20 b
> union
> select
> 10 a,
> 10 b
> ) u1
> union
> select 10, 10, 20) t
> where t.b = t.min_b;
> Result:
> +----+----+-------+
> | a | b | min_b |
> +----+----+-------+
> | 10 | 20 | 10 |
> | 10 | 10 | 20 |
> | 10 | 10 | 10 |
> +----+----+-------+
> Correct result:
> +----+----+-------+
> | a | b | min_b |
> +----+----+-------+
> | 10 | 10 | 10 |
> +----+----+-------+
> The underlying cause is that at the analyze part, the filter conjunct (t.b = t.min_b) is removed at [https://github.com/apache/impala/blob/356b7e5ddf7868968fb76ca55a8046d0291388fd/fe/src/main/java/org/apache/impala/analysis/Analyzer.java#L2955]
> This conjunct should not be removed.
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