GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/17454
[SPARK-20125][SQL] Dataset of type option of map does not work
## What changes were proposed in this pull request?
When we build the deserializer expression for map type, we will use
`StaticInvoke` to call `ArrayBasedMapData.toScalaMap`, and declare the return
type as `scala.collection.immutable.Map`. If the map is inside an Option, we
will wrap this `StaticInvoke` with `WrapOption`, which requires the input to be
`scala.collect.Map`. Ideally this should be fine, as
`scala.collection.immutable.Map` extends `scala.collect.Map`, but our
`ObjectType` is too strict about this, this PR fixes it.
## How was this patch tested?
new regression test
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark map
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17454.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 #17454
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commit 29a014374b7e8800133379cdf8ea921fc0381be8
Author: Wenchen Fan <[email protected]>
Date: 2017-03-28T08:18:08Z
option of map should work
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