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From "Takeshi Yamamuro (Jira)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-29701) Different answers when empty input given in GROUPING SETS
Date Mon, 02 Mar 2020 01:49:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-29701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17048728#comment-17048728
] 

Takeshi Yamamuro commented on SPARK-29701:
------------------------------------------

Yea, never mind. I don't have a smart idea now to solve this issue.

> Different answers when empty input given in GROUPING SETS
> ---------------------------------------------------------
>
>                 Key: SPARK-29701
>                 URL: https://issues.apache.org/jira/browse/SPARK-29701
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4, 3.0.0
>            Reporter: Takeshi Yamamuro
>            Priority: Critical
>              Labels: correctness
>
> A query below with an empty input seems to have different answers between PgSQL and Spark;
> {code:java}
> postgres=# create table gstest_empty (a integer, b integer, v integer);
> CREATE TABLE
> postgres=# select a, b, sum(v), count(*) from gstest_empty group by grouping sets ((a,b),());
>  a | b | sum | count 
> ---+---+-----+-------
>    |   |     |     0
> (1 row)
> {code}
> {code:java}
> scala> sql("""select a, b, sum(v), count(*) from gstest_empty group by grouping sets
((a,b),())""").show
> +---+---+------+--------+
> |  a|  b|sum(v)|count(1)|
> +---+---+------+--------+
> +---+---+------+--------+
>  {code}



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