GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/13648
[SQL][DOC][minor] document the contract of encoder serializer expressions
## What changes were proposed in this pull request?
In our encoder framework, we imply that serializer expressions should use
`BoundReference` to refer to the input object, and a lot of codes depend on
this contract(e.g. ExpressionEncoder.tuple). This PR adds some document and
assert in `ExpressionEncoder` to make it clearer.
## How was this patch tested?
existing tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark comment
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13648.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 #13648
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commit cdda303ed624aaf3389fb190ff8c473f06afa681
Author: Wenchen Fan <wenc...@databricks.com>
Date: 2016-06-13T20:26:01Z
document the contract of encoder serializer expressions
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