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From "Takeshi Yamamuro (Jira)" <j...@apache.org>
Subject [jira] [Created] (SPARK-29650) Discard a NULL constant in LIMIT
Date Wed, 30 Oct 2019 06:54:00 GMT
Takeshi Yamamuro created SPARK-29650:
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             Summary: 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


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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