[jira] [Assigned] (SPARK-22228) Add support for Array so from_json can parse

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-22228?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-22228:
------------------------------------

    Assignee: Apache Spark

> Add support for Array<primitive_type> so from_json can parse
> ------------------------------------------------------------
>
>                 Key: SPARK-22228
>                 URL: https://issues.apache.org/jira/browse/SPARK-22228
>             Project: Spark
>          Issue Type: Improvement
>          Components: Java API
>    Affects Versions: 2.2.0
>            Reporter: kant kodali
>            Assignee: Apache Spark
>
> {code:java}
> val inputDS = Seq("""["foo", "bar"]""").toDF
> {code}
> {code:java}
> inputDS.printSchema()
> root
>  |-- value: string (nullable = true)
> {code}
> Input Dataset inputDS
> {code:java}
> inputDS.show(false)
> value
> -----
> ["foo", "bar"]
> {code}
> Expected output dataset outputDS
> {code:java}
> value
> -------
> "foo" |
> "bar" |
> {code}
> Tried explode function like below but it doesn't quite work
> {code:java}
> inputDS.select(explode(from_json(col("value"), ArrayType(StringType))))
> {code}
> and got the following error
> {code:java}
> org.apache.spark.sql.AnalysisException: cannot resolve 'jsontostructs(`value`)' due to data type mismatch: Input schema string must be a struct or an array of structs
> {code}
> Also tried the following
> {code:java}
> inputDS.select(explode(col("value")))
> {code}
> And got the following error
> {code:java}
> org.apache.spark.sql.AnalysisException: cannot resolve 'explode(`value`)' due to data type mismatch: input to function explode should be array or map type, not StringType
> {code}



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