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https://issues.apache.org/jira/browse/SPARK-12723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15122102#comment-15122102
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Cheng Lian commented on SPARK-12723:
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Most of this issue is probably fixed in SPARK-12799 and PR #10757. But we
should do a thorough check.
> Comprehensive SQL generation support for expressions
> ----------------------------------------------------
>
> Key: SPARK-12723
> URL: https://issues.apache.org/jira/browse/SPARK-12723
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Cheng Lian
>
> Ensure that all built-in expressions can be mapped to its SQL representation
> if there is one (e.g. ScalaUDF doesn't have a SQL representation).
> A (possibly incomplete) list of unsupported expressions is provided in PR
> description of [PR #10541|https://github.com/apache/spark/pull/10541]:
> - Math expressions
> - String expressions
> - Null expressions
> - Calendar interval literal
> - Part of date time expressions
> - Complex type creators
> - Special NOT expressions, e.g. NOT LIKE and NOT IN
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