GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/15988
[SPARK-18519][SQL][BRANCH-2.0] map type can not be used in EqualTo
## What changes were proposed in this pull request?
Technically map type is not orderable, but can be used in equality
comparison. However, due to the limitation of the current implementation, map
type can't be used in equality comparison so that it can't be join key or
grouping key.
This PR makes this limitation explicit, to avoid wrong result.
backport https://github.com/apache/spark/pull/15956 to 2.0
## How was this patch tested?
updated tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark map-type
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15988.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 #15988
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commit acfa6ba6af5a1c484607d0be3b105c3d1829536c
Author: Wenchen Fan <wenc...@databricks.com>
Date: 2016-11-23T07:05:36Z
map type can not be used in EqualTo
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