GitHub user Parth-Brahmbhatt opened a pull request:
https://github.com/apache/spark/pull/13150
[SPARK-15365] [SQL]: When table size statistics are not available from
metastore, we should fallback to HDFS
## What changes were proposed in this pull request?
Currently if a table is used in join operation we rely on Metastore
returned size to calculate if we can convert the operation to Broadcast join.
This optimization only kicks in for table's that have the statistics available
in metastore. Hive generally rolls over to HDFS if the statistics are not
available directly from metastore and this seems like a reasonable choice to
adopt given the optimization benefit of using broadcast joins.
## How was this patch tested?
I have executed queries locally to test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/Parth-Brahmbhatt/spark SPARK-15365
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13150.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 #13150
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commit 702781d188846faceca9cd529984b21fa5b0d724
Author: Parth Brahmbhatt <pbrahmbh...@netflix.com>
Date: 2016-05-17T17:29:10Z
[SPARK-15365] [SQL]: When table size statistics are not available from
metastore, fall back to HDFS.
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