cloud-fan commented on a change in pull request #26509: [SPARK-29427][SQL] Add
API to convert RelationalGroupedDataset to KeyValueGroupedDataset
URL: https://github.com/apache/spark/pull/26509#discussion_r347721739
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File path:
sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala
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@@ -129,6 +130,34 @@ class RelationalGroupedDataset protected[sql](
(inputExpr: Expression) => exprToFunc(inputExpr)
}
+ /**
+ * Returns a `KeyValueGroupedDataset` where the data is grouped by the
grouping expressions
+ * of current `RelationalGroupedDataset`.
+ *
+ * @since 3.0.0
+ */
+ def as[U: Encoder, T: Encoder]: KeyValueGroupedDataset[U, T] = {
+ val keyEncoder = encoderFor[U]
+ val valueEncoder = encoderFor[T]
+
+ val aliasedGrps = groupingExprs.map { g =>
Review comment:
can we create a fake project to hold the grouping expressions and run the
analyzer to resolve?
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