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Posted to issues-all@impala.apache.org by "Zoltán Borók-Nagy (Jira)" <ji...@apache.org> on 2021/05/31 11:09:00 UTC
[jira] [Resolved] (IMPALA-10634) Removes outer join if it only has
DISTINCT on streamed side
[ https://issues.apache.org/jira/browse/IMPALA-10634?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zoltán Borók-Nagy resolved IMPALA-10634.
----------------------------------------
Resolution: Duplicate
> Removes outer join if it only has DISTINCT on streamed side
> -----------------------------------------------------------
>
> Key: IMPALA-10634
> URL: https://issues.apache.org/jira/browse/IMPALA-10634
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Yuming Wang
> Priority: Major
>
> Removes outer join if it only has DISTINCT on streamed side:
> {code:sql}
> CREATE TABLE t1(a int, b int);
> CREATE TABLE t2(a int, b int);
> SELECT DISTINCT t1.b FROM t1 LEFT JOIN t2 ON t1.a = t2.a;
> {code}
> We can rewrite {{SELECT DISTINCT b FROM t1 LEFT JOIN t2 ON t1.a = t2.a}} to {{SELECT DISTINCT t1.b FROM t1}}.
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