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https://issues.apache.org/jira/browse/SPARK-24027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16444724#comment-16444724
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Apache Spark commented on SPARK-24027:
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User 'MaxGekk' has created a pull request for this issue:
https://github.com/apache/spark/pull/21108
> Support MapType(StringType, DataType) as root type by from_json
> ---------------------------------------------------------------
>
> Key: SPARK-24027
> URL: https://issues.apache.org/jira/browse/SPARK-24027
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Maxim Gekk
> Priority: Major
>
> Currently, *MapType* is not supported by the *from_json* function as the root
> type. For example, the following code doesn't work on Spark 2.3:
> {code}
> scala> import org.apache.spark.sql.types._
> import org.apache.spark.sql.types._
> scala> val schema = MapType(StringType, IntegerType)
> schema: org.apache.spark.sql.types.MapType =
> MapType(StringType,IntegerType,true)
> scala> val in = Seq("""{"a": 1, "b": 2, "c": 3}""").toDS()
> in: org.apache.spark.sql.Dataset[String] = [value: string]
> scala> in.select(from_json($"value", schema, Map[String, String]())).collect()
> org.apache.spark.sql.AnalysisException: cannot resolve
> 'jsontostructs(`value`)' due to data type mismatch: Input schema
> map<string,int> must be a struct or an array of structs.
> {code}
> Purpose of the ticket is to support _MapType with StringType as keys type_.
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