GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/11786
[SPARK-13976][SQL] do not remove sub-queries added by user when generate SQL
## What changes were proposed in this pull request?
We haven't figured out the corrected logical to add sub-queries yet, so we
should not clear all sub-queries before generate SQL. This PR changed the logic
to only remove sub-queries above table relation.
TODO: for long term, we should find a way to add sub-queries correctly, so
that arbitrary logical plans can be converted to SQL string.
## How was this patch tested?
`LogicalPlanToSQLSuite`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark bug-fix
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11786.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 #11786
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commit ee5a43739b895708c054558c62263a6a59aa4b1e
Author: Wenchen Fan <[email protected]>
Date: 2016-03-17T16:08:16Z
do not remove sub-queries added by user when generate SQL
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