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https://issues.apache.org/jira/browse/SPARK-29946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16976960#comment-16976960
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L. C. Hsieh commented on SPARK-29946:
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Ur, this is for Map type data serialization in JacksonGenerator, not
MapType.toString.
You can check how JacksonGenerator serializes map type data.
> Special serialization for certain key types of Map type in JacksonGenerator
> ---------------------------------------------------------------------------
>
> Key: SPARK-29946
> URL: https://issues.apache.org/jira/browse/SPARK-29946
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: L. C. Hsieh
> Priority: Major
> Attachments: image-2019-11-18-16-54-46-341.png
>
>
> Currently JacksonGenerator serializes MapType to JSON, the key of map is
> serialized by calling toString() of the key. For some types, like UnsafeRow,
> the toString is not human readable. So currently the map key in JSON is not
> very useful for some types.
> We should do special serialization for certain key types of Map.
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