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https://issues.apache.org/jira/browse/SPARK-21218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16065210#comment-16065210
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Michael Styles commented on SPARK-21218:
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In Parquet 1.7, there as a bug involving corrupt statistics on binary columns
(https://issues.apache.org/jira/browse/PARQUET-251). This bug prevented earlier
versions of Spark from generating Parquet filters on any string columns. Spark
2.1 has moved up to Parquet 1.8.2, so this issue no longer exists.
> Convert IN predicate to equivalent Parquet filter
> -------------------------------------------------
>
> Key: SPARK-21218
> URL: https://issues.apache.org/jira/browse/SPARK-21218
> Project: Spark
> Issue Type: Improvement
> Components: Optimizer
> Affects Versions: 2.1.1
> Reporter: Michael Styles
> Attachments: IN Predicate.png, OR Predicate.png
>
>
> Convert IN predicate to equivalent expression involving equality conditions
> to allow the filter to be pushed down to Parquet.
> For instance,
> C1 IN (10, 20) is rewritten as (C1 = 10) OR (C1 = 20)
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