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https://issues.apache.org/jira/browse/SPARK-4453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14214949#comment-14214949
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Apache Spark commented on SPARK-4453:
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User 'liancheng' has created a pull request for this issue:
https://github.com/apache/spark/pull/3317
> Simplify Parquet record filter generation
> -----------------------------------------
>
> Key: SPARK-4453
> URL: https://issues.apache.org/jira/browse/SPARK-4453
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.0.0, 1.1.0
> Reporter: Cheng Lian
>
> Current Parquet record filter code uses {{CatalystFilter}} and its
> sub-classes to represent all Spark SQL Parquet filter. Essentially, these
> classes combines the original Catalyst predicate expression together with the
> generated Parquet filter. {{ParquetFilters.findExpression}} then uses these
> classes to filter out all expressions that can be pushed down.
> However, this {{findExpression}} function is not necessary at the first
> place, since we already know whether a predicate can be pushed down or not
> while trying to generate its corresponding filter.
> With this in mind, the code size of Parquet record filter generation can be
> reduced significantly.
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