GitHub user Terranlee opened a pull request:
https://github.com/apache/incubator-quickstep/pull/229
Implement parser and resolver for UNION and INTERSECT operators
This pull request implements the parser and resolver parts of set
operations (`UNION` and `INTERSECT`).
It also supports composite set operations, e.g.
```
SELECT * FROM a
UNION ALL
SELECT * FROM b
UNION ALL
SELECT * FROM c
INTERSECT
SELECT * FROM d;
```
Note: will add parser and resolver tests, so do not merge yet.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/Terranlee/incubator-quickstep
union-operator-parser
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-quickstep/pull/229.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 #229
----
commit ddce20354ab70df1bda53d65f6e2266f50bc5e44
Author: TianrunLi <tli...@wisc.edu>
Date: 2016-12-20T15:23:24Z
Implement parser and resolver for UNION and INTERSECT.
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