Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21620#discussion_r197737278
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -536,6 +536,13 @@ object TypeCoercion {
case None => c
}
+ case aj @ ArrayJoin(arr, d, nr) if
!ArrayType(StringType).acceptsType(arr.dataType) &&
+ ArrayType.acceptsType(arr.dataType) =>
+ val containsNull =
arr.dataType.asInstanceOf[ArrayType].containsNull
+ ImplicitTypeCasts.implicitCast(arr, ArrayType(StringType,
containsNull))
--- End diff --
nit: usually we try to avoid long chains of functions, what about:
```
ImplicitTypeCasts.implicitCast(arr, ArrayType(StringType, containsNull))
match {
...
}
```
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