Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11177#discussion_r52806016
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/Expand.scala ---
@@ -71,9 +80,86 @@ case class Expand(
idx = 0
}
+ numOutputRows += 1
result
}
}
}
}
+
+ override def upstream(): RDD[InternalRow] = {
+ child.asInstanceOf[CodegenSupport].upstream()
+ }
+
+ protected override def doProduce(ctx: CodegenContext): String = {
+ child.asInstanceOf[CodegenSupport].produce(ctx, this)
+ }
+
+ override def doConsume(ctx: CodegenContext, input: Seq[ExprCode]):
String = {
+ // Some columns have the same expression in all the projections, so
collect the unique
+ // expressions.
+ val columnUniqueExpressions: IndexedSeq[Set[Expression]] =
output.indices.map { i =>
--- End diff --
for this one, can we explain what the indexes are, and what the expressions
are?
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