GitHub user lianhuiwang opened a pull request:
https://github.com/apache/spark/pull/18193
[SPARK-15616] [SQL] Metastore relation should fallback to HDFS size of
partitions that are involved in Query for JoinSelection.
## What changes were proposed in this pull request?
Currently if some partitions of a partitioned table are used in join
operation we rely on Metastore returned size of table to calculate if we can
convert the operation to Broadcast join.
if Filter can prune some partitions, Hive can prune partition before
determining to use broadcast joins according to HDFS size of partitions that
are involved in Query.So sparkSQL needs it that can improve join's performance
for partitioned table.
## How was this patch tested?
add unit tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/lianhuiwang/spark partition_broadcast_2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18193.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 #18193
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commit 5591a1c7623e4c668b257c940b5b2663f67acf51
Author: lianhuiwang <lianhuiwan...@gmail.com>
Date: 2017-06-04T07:02:23Z
init commit
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