GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/10059
[SPARK-12068][SQL] use a single column in Dataset.groupBy and count will
fail
The reason is that, for a single culumn `RowEncoder`(or a single field
product encoder), when we use it as the encoder for grouping key, we should
also combine the grouping attributes, although there is only one grouping
attribute.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark bug
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10059.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 #10059
----
commit 9fe07fdd3d7cbf406322d7d49ab02e2ec37179e5
Author: Wenchen Fan <[email protected]>
Date: 2015-12-01T06:16:47Z
use ExpressionEncoder.flat to decide whether to combine grouping attributes
or not
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