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Posted to issues@spark.apache.org by "Michael Armbrust (JIRA)" <ji...@apache.org> on 2014/11/18 00:26:33 UTC
[jira] [Updated] (SPARK-4453) Simplify Parquet record filter
generation
[ https://issues.apache.org/jira/browse/SPARK-4453?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Armbrust updated SPARK-4453:
------------------------------------
Assignee: Cheng Lian
> 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
> Assignee: 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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