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https://issues.apache.org/jira/browse/SPARK-24543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16510769#comment-16510769
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Apache Spark commented on SPARK-24543:
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User 'MaxGekk' has created a pull request for this issue:
https://github.com/apache/spark/pull/21550
> Support any DataType as DDL string for from_json's schema
> ---------------------------------------------------------
>
> Key: SPARK-24543
> URL: https://issues.apache.org/jira/browse/SPARK-24543
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.1
> Reporter: Maxim Gekk
> Priority: Minor
>
> Currently, schema for from_json can be specified as DataType or a string in
> the following formats:
> * in SQL, as sequence of fields like _INT a, STRING b
> * in Scala, Python and etc, in JSON format or as in SQL
> The ticket aims to support arbitrary DataType as DDL string for from_json.
> For example:
> {code:sql}
> select from_json('{"a":1, "b":2}', 'map<string, int>')
> {code}
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