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https://issues.apache.org/jira/browse/DRILL-5697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16129087#comment-16129087
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ASF GitHub Bot commented on DRILL-5697:
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GitHub user ppadma opened a pull request:
https://github.com/apache/drill/pull/907
DRILL-5697: Improve performance of filter operator for pattern matching
Implement character by character matching for simple patterns and fallback
to regex for more complicated patterns. See DRILL-5697 for more details.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ppadma/drill DRILL-5697
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/907.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 #907
----
commit f384475baea0ab05e84b3ac7b45118bb0b0ea5ce
Author: Padma Penumarthy <ppenuma...@yahoo.com>
Date: 2017-08-07T22:11:00Z
DRILL-5697: Improve performance of filter operator for pattern matching
----
> Improve performance of filter operator for pattern matching
> -----------------------------------------------------------
>
> Key: DRILL-5697
> URL: https://issues.apache.org/jira/browse/DRILL-5697
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Flow
> Affects Versions: 1.11.0
> Reporter: Padma Penumarthy
> Assignee: Padma Penumarthy
>
> Queries using filter with sql like operator use Java regex library for
> pattern matching. However, for cases like %abc (ends with abc), abc% (starts
> with abc), %abc% (contains abc), it is observed that implementing these cases
> with simple code instead of using regex library provides good performance
> boost (4-6x). Idea is to use special case code for simple, common cases and
> fall back to Java regex library for complicated ones. That will provide good
> performance benefit for most common cases.
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