GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/10793
[SPARK-12853][SQL] ignore bucketing information if we do not need it
The idea is: use a place holder for `LogicalRelation` that can delay the
scan and carry bucketing information, during planning. Then we add a rule to
randomly pick one place holder from the physical plan, try to disable bucketing
and see if we will add extra shuffle. If no extra shuffle is added, it means
the bucketing for this relation is unnecessary, we can ignore it and do a
normal scan. If extra shuffle is added, we do a bucket scan.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark bucket-read-enhance
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10793.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 #10793
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commit 45a8be3cfd23c44b47715bfe9021f3e73d1d1ded
Author: Wenchen Fan <[email protected]>
Date: 2016-01-17T09:19:34Z
ignore bucketing information if we do not need it
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