GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/11106
[SPARK-13225] [SQL] Support Intersect All/Distinct [WIP]
In the SQL2003 Syntax, INTERSECT supports both ALL and DISTINCT
```
<SELECT statement1>
INTERSECT [ALL | DISTINCT]
<SELECT statement2>
```
This PR is to support both.
- [x] Enable both optional key words `ALL` and `DISTINCT` when parsing
`INTERSECT` in SQL Parser;
- [x] Add a new option `INTERSECT ALL `. It avoids adding extra
`DISTINCT` above `Left-semi JOIN` after conversion from Intersect to `Left-semi
JOIN`.
- [ ] Add the corresponding APIs of Dataframe and Dataset.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark intersectDistinct
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11106.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 #11106
----
commit 95afce5f02f86c1aa3cf22f81c79d8d9e46c1e0a
Author: gatorsmile <[email protected]>
Date: 2016-02-07T00:52:48Z
"intersect all"
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