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https://issues.apache.org/jira/browse/SPARK-21651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16119158#comment-16119158
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Takeshi Yamamuro commented on SPARK-21651:
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What's the concrete example?
> Detect MapType in Json InferSchema
> ----------------------------------
>
> Key: SPARK-21651
> URL: https://issues.apache.org/jira/browse/SPARK-21651
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.0, 2.1.1, 2.2.0
> Reporter: Jochen Niebuhr
> Priority: Minor
>
> When loading Json Files which include a map with very variable keys, the
> current schema infer logic might create a very large schema. This will lead
> to long load times and possibly out of memory errors.
> I've already submitted a pull request to the mongo spark driver which had the
> same problem. Should I port this logic over to the json schema infer class?
> The MongoDB Spark pull request mentioned is:
> https://github.com/mongodb/mongo-spark/pull/24
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