GitHub user saucam opened a pull request:
https://github.com/apache/spark/pull/2841
SPARK-3968 Use parquet-mr filter2 api in spark sql
The parquet-mr project has introduced a new filter api
(https://github.com/apache/incubator-parquet-mr/pull/4), along with several
fixes . It can also eliminate entire RowGroups depending on certain statistics
like min/max
We can leverage that to further improve performance of queries with filters.
Also filter2 api introduces ability to create custom filters. We can create
a custom filter for the optimized In clause (InSet) , so that elimination
happens in the ParquetRecordReader itself
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/saucam/spark master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/2841.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2841
----
commit 0bc54d3c0384606886a3e297cfdc85f44e2ea7e9
Author: Yash Datta <[email protected]>
Date: 2014-10-16T12:15:21Z
SPARK-3968: Change parquet filter pushdown to use filter2 api of parquet-mr
commit 6adaf9b33f07ed247643ddf14020db69ece9d4fb
Author: Yash Datta <[email protected]>
Date: 2014-10-18T13:15:45Z
SPARK-3968: Not pushing the filters in case of OPTIONAL columns
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