[jira] [Commented] (SPARK-4453) Simplify Parquet record filter generation

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-4453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14214949#comment-14214949 ] 

Apache Spark commented on SPARK-4453:
-------------------------------------

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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