GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/15101
[SPARK-17114][SQL] Fix aggregates grouped by literals with empty input
## What changes were proposed in this pull request?
This PR fixes an issue with aggregates that have an empty input, and use a
literals as their grouping keys. These aggregates are currently interpreted as
aggregates **without** grouping keys, this triggers the ungrouped code path
(which aways returns a single row).
This PR fixes the `RemoveLiteralFromGroupExpressions` optimizer rule, which
changes the semantics of the Aggregate by eliminating all literal grouping keys.
## How was this patch tested?
Added tests to `SQLQueryTestSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-17114-3
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15101.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 #15101
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commit 25eee308137c9ec034f8326e23de46958e7a8b20
Author: Herman van Hovell <[email protected]>
Date: 2016-09-14T20:52:34Z
attempt 3
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