Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10283#discussion_r48048560
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LocalRelation.scala
---
@@ -29,20 +30,28 @@ object LocalRelation {
new LocalRelation(StructType(output1 +: output).toAttributes)
}
+ def fromInternalRows(output: Seq[Attribute], data: Seq[InternalRow]):
LocalRelation = {
+ val projection =
UnsafeProjection.create(output.map(_.dataType).toArray)
+ new LocalRelation(output, data.map(projection(_).copy()))
+ }
+
def fromExternalRows(output: Seq[Attribute], data: Seq[Row]):
LocalRelation = {
val schema = StructType.fromAttributes(output)
val converter =
CatalystTypeConverters.createToCatalystConverter(schema)
- LocalRelation(output, data.map(converter(_).asInstanceOf[InternalRow]))
+ val internalRows = data.map(converter(_).asInstanceOf[InternalRow])
+ fromInternalRows(output, internalRows)
}
- def fromProduct(output: Seq[Attribute], data: Seq[Product]):
LocalRelation = {
+ def fromProduct[T <: Product : ExpressionEncoder](
+ output: Seq[Attribute],
+ data: Seq[T]): LocalRelation = {
+ val encoder = implicitly[ExpressionEncoder[T]]
--- End diff --
we can use `encoderFor[T]` here
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