GitHub user ppadma opened a pull request:
https://github.com/apache/drill/pull/802
DRILL-5394: Optimize query planning for MapR-DB tables by caching rowâ¦
⦠counts
During the planning phase, we fetch MapR DB table row count multiple times.
This is an expensive operation and fetching it multiple times increases
planning time considerably. Implemented per query cache. Fetch table rowCount
only once, cache it in hbaseScanSpec and reuse it. Copy the rowCount from old
to new hbaseScanSpec when a new groupScan is created i.e. when the filter is
pushed down into scan.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ppadma/drill DRILL-5394
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/802.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 #802
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commit 8ff826c58f074ba58d1ee1b888b5da41eeb2d894
Author: Padma Penumarthy <[email protected]>
Date: 2017-03-16T18:40:13Z
DRILL-5394: Optimize query planning for MapR-DB tables by caching row counts
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