GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/11818
[SPARK-14001][SQL] support multi-children Union in SQLBuilder
## What changes were proposed in this pull request?
The fix is simple, use the existing `CombineUnions` rule to combine
adjacent Unions before build SQL string.
## How was this patch tested?
The re-enabled test
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/11818.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 #11818
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commit 723e2af1fe9c320c5f727b421b9bca74bbe1cfa9
Author: Wenchen Fan <[email protected]>
Date: 2016-03-18T08:44:53Z
support multi-children Union in SQLBuilder
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