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https://issues.apache.org/jira/browse/SPARK-29650?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-29650.
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Resolution: Invalid
> 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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