GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/18169
[SPARK-20941] [SQL] Fix SubqueryExec Reuse
### What changes were proposed in this pull request?
Before this PR, Subquery reuse does not work. Below are three issues:
- Subquery reuse does not work.
- It is sharing the same `SQLConf` (`spark.sql.exchange.reuse`) with the
one for Exchange Reuse.
- No test case covers the rule Subquery reuse.
This PR is to fix the above three issues.
- Ignored the physical operator `SubqueryExec` when comparing two plans.
- Added a dedicated conf `spark.sql.subqueries.reuse` for controling
Subquery Reuse
- Added a test case for verifying the behavior
### How was this patch tested?
N/A
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark subqueryReuse
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18169.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 #18169
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commit 399a2115ef45a8b3f37eeaef617bc179606773c5
Author: Xiao Li <[email protected]>
Date: 2017-05-31T22:02:42Z
fix
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