GitHub user goldmedal opened a pull request:
https://github.com/apache/spark/pull/18875
[SPARK-21513][SQL] Allow UDF to_json support converting MapType to json
# What changes were proposed in this pull request?
UDF to_json only supports converting `StructType` or `ArrayType` of
`StructType`s to a json output string now.
According to the discussion of JIRA SPARK-21513, I allow to `to_json`
support converting `MapType<DataType, StructType>` to a json output string.
# How was this patch tested?
Adding unit test case.
cc @viirya @HyukjinKwon
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/goldmedal/spark SPARK-21513
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18875.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 #18875
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