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https://issues.apache.org/jira/browse/SPARK-19898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15904992#comment-15904992
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Takeshi Yamamuro commented on SPARK-19898:
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A prototype I dropped in pr#16981 is here:
https://github.com/apache/spark/compare/master...maropu:SPARK-19637-2
> Add from_json in FunctionRegistry
> ---------------------------------
>
> Key: SPARK-19898
> URL: https://issues.apache.org/jira/browse/SPARK-19898
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Takeshi Yamamuro
> Priority: Minor
>
> In SPARK-19637, `to_json` has been added in FunctionRegistry. As for
> `from_json`, we do not add yet because how users specify schema as SQL
> strings is not clear (See https://github.com/apache/spark/pull/16981 for
> related discussion).
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