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Posted to issues@calcite.apache.org by "Chunwei Lei (Jira)" <ji...@apache.org> on 2020/09/09 08:02:00 UTC
[jira] [Assigned] (CALCITE-4239) RelMdUniqueKeys returns wrong
unique keys for Aggregate with grouping sets
[ https://issues.apache.org/jira/browse/CALCITE-4239?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chunwei Lei reassigned CALCITE-4239:
------------------------------------
Assignee: Chunwei Lei
> RelMdUniqueKeys returns wrong unique keys for Aggregate with grouping sets
> --------------------------------------------------------------------------
>
> Key: CALCITE-4239
> URL: https://issues.apache.org/jira/browse/CALCITE-4239
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Chunwei Lei
> Assignee: Chunwei Lei
> Priority: Major
>
> For Aggregate with grouping sets, group by keys might not form a unique key. For example:
> {code:java}
> //PostgreSQL
> create table test2(key bigint, value bigint);
> insert into test2 values
> (1, null),
> (null, 1);
> select key, value, count(*) from test2
> group by GROUPING SETS (key,value)
> ;
> postgres=# select key, value, count(*) from test2
> postgres-# group by GROUPING SETS (key,value)
> postgres-# ;
> key | value | count
> -----+-------+-------
> | | 1
> 1 | | 1
> | | 1
> | 1 | 1
> (4 rows)
> {code}
>
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