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https://issues.apache.org/jira/browse/DRILL-4201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15062688#comment-15062688
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ASF GitHub Bot commented on DRILL-4201:
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GitHub user jinfengni opened a pull request:
https://github.com/apache/drill/pull/305
DRILL-4201 : Allow partial filter to be pushed down project for bette…
…r performance.
Partial filter pushdown has performance benefits because:
1) enable partition pruning, if the pushed down involves partitioning
columns,
2) allow the filter to be applied in upper stream.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jinfengni/incubator-drill DRILL-4201
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/305.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 #305
----
commit 68203ad035f65d1708ce228df432d5b23f4af3ba
Author: Jinfeng Ni <j...@apache.org>
Date: 2015-12-12T00:00:13Z
DRILL-4201 : Allow partial filter to be pushed down project for better
performance.
Partial filter pushdown has performance benefits because:
1) enable partition pruning, if the pushed down involves partitioning
columns,
2) allow the filter to be applied in upper stream.
----
> DrillPushFilterPastProject should allow partial filter pushdown.
> -----------------------------------------------------------------
>
> Key: DRILL-4201
> URL: https://issues.apache.org/jira/browse/DRILL-4201
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Reporter: Jinfeng Ni
> Assignee: Jinfeng Ni
> Fix For: 1.5.0
>
>
> Currently, DrillPushFilterPastProjectRule will stop pushing the filter down,
> if the filter itself has ITEM or FLATTEN function, or its input reference is
> referring to an ITEM or FLATTEN function. However, in case that the filter is
> a conjunction of multiple sub-filters, some of them refer to ITEM or FLATTEN
> but the other not, then we should allow partial filter to be pushed down. For
> instance,
> WHERE partition_col > 10 and flatten_output_col = 'ABC'.
> The "flatten_output_col" comes from the output of FLATTEN operator, and
> therefore flatten_output_col = 'ABC' should not pushed past the project. But
> partiion_col > 10 should be pushed down, such that we could trigger the
> pruning rule to apply partition pruning.
> It would be improve Drill query performance, when the partially pushed filter
> leads to partition pruning, or the partially pushed filter results in early
> filtering in upstream operator.
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