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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} -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org