GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/10073
[SPARK-12032] [SQL] Re-order inner joins to do join with conditions first
Currently, the order of joins is exactly the same as SQL query, some
conditions may not pushed down to the correct join, then those join will become
cross product and is extremely slow.
This patch try to re-order the inner joins (which are common in SQL query),
pick the joins that have self-contain conditions first, delay those that does
not have conditions.
After this patch, the TPCDS query Q64/65 can run hundreds times faster.
cc @marmbrus @nongli
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark reorder_joins
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10073.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 #10073
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commit 18af774ee3fb15fb3694e3454640dc145d908d5b
Author: Davies Liu <[email protected]>
Date: 2015-12-01T00:27:48Z
reorder inner joins
commit 1a32fea642a905f88a463f0f0ad8c540cd32202b
Author: Davies Liu <[email protected]>
Date: 2015-12-01T19:58:10Z
refactor
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