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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2015/05/28 08:15:17 UTC
[jira] [Commented] (SPARK-6624) Convert filters into CNF for data
sources
[ https://issues.apache.org/jira/browse/SPARK-6624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14562349#comment-14562349 ]
Reynold Xin commented on SPARK-6624:
------------------------------------
[~cloud_fan] interested in doing this one also?
> 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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