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From "Aman Omer (Jira)" <j...@apache.org>
Subject [jira] [Comment Edited] (SPARK-29650) Discard a NULL constant in LIMIT
Date Thu, 31 Oct 2019 06:34:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-29650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16963686#comment-16963686
] 

Aman Omer edited comment on SPARK-29650 at 10/31/19 6:33 AM:
-------------------------------------------------------------

{code:java}
select * from TName limit(int(1));{code}
Successful.

 
{code:java}
select * from str limit(int(null));{code}
Failed with error "_The evaluated limit expression must not be null, but got CAST(NULL AS
INT)";_


was (Author: aman_omer):
 
{code:java}
select * from TName limit(int(1));{code}
Successful.

 
{code:java}
select * from str limit(int(null));{code}
 

Failed with error "_The evaluated limit expression must not be null, but got CAST(NULL AS
INT)";_

 

 

 

> 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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