GitHub user vkorukanti opened a pull request:
https://github.com/apache/drill/pull/301
DRILL-4194: Improve the performance of metadata fetch operation in HiveScan
+ Use the stats (numRows) stored in Hive metastore whenever available to
calculate the costs for planning purpose
+ Delay the costly operation of loading of InputSplits until needed. When
InputSplits are loaded, cache them at query level to speedup subsequent
access.
@jinfengni, @amansinha100 Could you please review the patch?
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/vkorukanti/drill hive_lazyload
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/301.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 #301
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commit 0b8654e472bad2c76bbd84f5f9bbe0cd521a3898
Author: vkorukanti <[email protected]>
Date: 2015-12-15T00:02:55Z
DRILL-4198: Enhance StoragePlugin interface to expose logical space rules
for planning purpose
Also move Hive partition pruning rules to logical storage plugin rulesets.
commit 48520c93744f0865731a763c8447a720f80842a0
Author: vkorukanti <[email protected]>
Date: 2015-12-11T19:36:11Z
DRILL-4194: Improve performance of the HiveScan metadata fetch operation
+ Use the stats (numRows) stored in Hive metastore whenever available to
calculate the costs for planning purpose
+ Delay the costly operation of loading of InputSplits until needed. When
InputSplits are loaded, cache them at query level to speedup subsequent
access.
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