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https://issues.apache.org/jira/browse/SPARK-6624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15590650#comment-15590650
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Apache Spark commented on SPARK-6624:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/15558
> Convert filters into CNF for data sources
> -----------------------------------------
>
> Key: SPARK-6624
> URL: https://issues.apache.org/jira/browse/SPARK-6624
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
>
> We should turn filters into conjunctive normal form (CNF) before we pass them
> to data sources. Otherwise, filters are not very useful if there is a single
> filter with a bunch of ORs.
> Note that we already try to do some of these in BooleanSimplification, but I
> think we should just formalize it to use CNF.
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