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Takuya UESHIN f176dd3f28 [SPARK-27314][SQL] Deduplicate exprIds for Union. 
## What changes were proposed in this pull request?

We have been having a potential problem with `Union` when the children have the same expression id in their outputs, which happens when self-union.

## How was this patch tested?

Modified some tests to adjust plan changes.

Closes #24236 from ueshin/issues/SPARK-27314/dedup_union.

Authored-by: Takuya UESHIN <ueshin@databricks.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2019-03-29 14:05:38 -07:00
..
main [SPARK-27314][SQL] Deduplicate exprIds for Union. 2019-03-29 14:05:38 -07:00
test [SPARK-27314][SQL] Deduplicate exprIds for Union. 2019-03-29 14:05:38 -07:00