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https://issues.apache.org/jira/browse/SPARK-24870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16550131#comment-16550131
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Apache Spark commented on SPARK-24870:
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User 'eatoncys' has created a pull request for this issue:
https://github.com/apache/spark/pull/21823
> Cache can't work normally if there are case letters in SQL
> ----------------------------------------------------------
>
> Key: SPARK-24870
> URL: https://issues.apache.org/jira/browse/SPARK-24870
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.1
> Reporter: eaton
> Priority: Major
>
> Cache can't work normally if there are case letters in SQL,
> for example:
> sql("CREATE TABLE IF NOT EXISTS src (key INT, value STRING) USING hive")
> sql("select key, sum(case when Key > 0 then 1 else 0 end) as positiveNum " +
> "from src group by key").cache().createOrReplaceTempView("src_cache")
> sql(
> s"""select a.key
> from
> (select key from src_cache where positiveNum = 1)a
> left join
> (select key from src_cache )b
> on a.key=b.key
> """).explain
>
> The subquery "select key from src_cache where positiveNum = 1" on the left of
> join can use the cache data, but the subquery "select key from src_cache" on
> the right of join cannot use the cache data.
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