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author | Wenchen Fan <wenchen@databricks.com> | 2016-03-18 19:42:33 +0800 |
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committer | Cheng Lian <lian@databricks.com> | 2016-03-18 19:42:33 +0800 |
commit | 0f1015ffdd40cd8647f6acdd5cdd717b883e4875 (patch) | |
tree | 60fc71f07a9a8ee02c404b07c8e46fe5d72850f5 /docs | |
parent | 7783b6f38ffb320050e1c826134187cd0f29ee9b (diff) | |
download | spark-0f1015ffdd40cd8647f6acdd5cdd717b883e4875.tar.gz spark-0f1015ffdd40cd8647f6acdd5cdd717b883e4875.tar.bz2 spark-0f1015ffdd40cd8647f6acdd5cdd717b883e4875.zip |
[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
Author: Wenchen Fan <wenchen@databricks.com>
Closes #11818 from cloud-fan/bug-fix.
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