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https://issues.apache.org/jira/browse/SPARK-2908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14089837#comment-14089837
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Apache Spark commented on SPARK-2908:
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User 'yhuai' has created a pull request for this issue:
https://github.com/apache/spark/pull/1840
> JsonRDD.nullTypeToStringType does not convert all NullType to StringType
> ------------------------------------------------------------------------
>
> Key: SPARK-2908
> URL: https://issues.apache.org/jira/browse/SPARK-2908
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Yin Huai
> Assignee: Yin Huai
>
> Failed on
> {code}
> val schemaRDD = jsonRDD(sparkContext.parallelize(Seq("""{"record":
> [{"children": null}]}""")))
> {code}
> {code}
> schemaRDD.schema
> StructType(ArrayBuffer(StructField(record,ArrayType(StructType(ArrayBuffer(StructField(children,NullType,true))),false),true)))
> {code}
> You can see the children field is still NullType.
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