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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