[jira] [Created] (SPARK-19716) Dataset should allow by-name resolution for struct type elements in array

["Wenchen Fan (JIRA)" <ji...@apache.org>]

Wenchen Fan created SPARK-19716:
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             Summary: Dataset should allow by-name resolution for struct type elements in array
                 Key: SPARK-19716
                 URL: https://issues.apache.org/jira/browse/SPARK-19716
             Project: Spark
          Issue Type: New Feature
          Components: SQL
    Affects Versions: 2.2.0
            Reporter: Wenchen Fan


if we have a DataFrame with schema {{<a: int, b: int, c: int>}}, and convert it to Dataset with {{case class Data(a: Int, c: Int)}}, it works and we will extract the `a` and `c` columns to build the Data.

However, if the struct is inside array, e.g. schema is {{<arr: array<a: int, b: int, c: int>>}}, and we wanna convert it to Dataset with {{case class ComplexData(arr: Seq[Data])}}, we will fail. we should support this case.



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