GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/14228
[SPARK-16583] [SQL] [WIP] Improve Partition Pruning in InMemoryTableScanExec
#### What changes were proposed in this pull request?
Currently, column pruning in `InMemoryTableScanExec` only can utilize the
predicates whose either left or right side is foldable expressions. We can
further extend the existing framework to utilize the predicates in which both
sides are attribute references. Through their maximal and minimal boundary
values, we can prune the unnecessary partitions. The performance improvement
depends on the data distribution and predicates.
TODO: more examples here.
#### How was this patch tested?
TODO: added more test cases
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark inMemory
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14228.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 #14228
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commit fd4794debb27cf766ce1fedd0b693b6b7f8b7073
Author: gatorsmile <[email protected]>
Date: 2016-07-11T21:18:25Z
play1
commit 6cb4291758e27f2bd1c1dc1b4e2fe2ad528d1d1d
Author: gatorsmile <[email protected]>
Date: 2016-07-12T05:22:20Z
test case fix.
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