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https://issues.apache.org/jira/browse/SPARK-12727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15122124#comment-15122124
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Cheng Lian commented on SPARK-12727:
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It would be nice if we can recover the original distinct aggregation SQL query.
But we can also call it a done if we simply wrap all unrecognized patterns into
subqueries. In this way the generated SQL query string can be quite verbose,
but the optimizer will do the hard work.
> SQL generation support for distinct aggregation patterns that fit
> DistinctAggregationRewriter analysis rule
> -----------------------------------------------------------------------------------------------------------
>
> Key: SPARK-12727
> URL: https://issues.apache.org/jira/browse/SPARK-12727
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Cheng Lian
>
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