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From "Xiao Li (Jira)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-29650) Discard a NULL constant in LIMIT
Date Sun, 01 Dec 2019 22:25:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-29650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16985701#comment-16985701
] 

Xiao Li commented on SPARK-29650:
---------------------------------

Let us first close this JIRA. If needed, we can open a separate Jira for supporting expressions
in the LIMIT clause. 

> Discard a NULL constant in LIMIT
> --------------------------------
>
>                 Key: SPARK-29650
>                 URL: https://issues.apache.org/jira/browse/SPARK-29650
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Takeshi Yamamuro
>            Priority: Major
>
> In PostgreSQL, a NULL constant is accepted in LIMIT and its just ignored.
> But, in spark, it throws an exception below;
> {code:java}
> select * from int8_tbl limit (case when random() < 0.5 then bigint(null) end);
> org.apache.spark.sql.AnalysisException
> The limit expression must evaluate to a constant value, but got CASE WHEN (`_nondeterministic`
< CAST(0.5BD AS DOUBLE)) THEN CAST(NULL AS BIGINT) END; {code}



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