Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/18257#discussion_r121287421
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
---
@@ -482,11 +482,17 @@ case class Sort(
/** Factory for constructing new `Range` nodes. */
object Range {
- def apply(start: Long, end: Long, step: Long, numSlices: Option[Int]):
Range = {
+ def apply(start: Long, end: Long, step: Long, numSlices: Option[Int])
+ : LeafNode with MultiInstanceRelation = {
val output = StructType(StructField("id", LongType, nullable = false)
:: Nil).toAttributes
- new Range(start, end, step, numSlices, output)
+ if (start == end || (start < end ^ 0 < step)) {
+ LocalRelation(output)
--- End diff --
@kiszk . What is the difference in your `empty` Range and invalid Range? It
looks to me the same in your suggestion.
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