GitHub user marmbrus opened a pull request:
https://github.com/apache/spark/pull/11011
[SPARK-13087][SQL] Fix group by function for sort based aggregation
It is not valid to call `toAttribute` on a `NamedExpression` unless we know
for sure that the child produced that `NamedExpression`. The current code
worked fine when the grouping expressions were simple, but when they were a
derived value this blew up at execution time.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/marmbrus/spark groupByFunction
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11011.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 #11011
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commit e605a0920e7b9fac389fcb8111d490eabef5e52e
Author: Michael Armbrust <mich...@databricks.com>
Date: 2016-02-02T01:08:47Z
[SPARK-13087][SQL] Fix group by function for sort based aggregation
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