Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18189#discussion_r120296682
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/hints.scala
---
@@ -51,19 +51,17 @@ case class ResolvedHint(child: LogicalPlan, hints:
HintInfo = HintInfo())
}
-case class HintInfo(
- isBroadcastable: Option[Boolean] = None) {
+case class HintInfo(broadcast: Boolean = false) {
/** Must be called when computing stats for a join operator to reset
hints. */
- def resetForJoin(): HintInfo = copy(
- isBroadcastable = None
- )
+ def resetForJoin(): HintInfo = copy(broadcast = false)
override def toString: String = {
- if (productIterator.forall(_.asInstanceOf[Option[_]].isEmpty)) {
- "none"
- } else {
- isBroadcastable.map(x => s"isBroadcastable=$x").getOrElse("")
+ val hints = scala.collection.mutable.ArrayBuffer.empty[String]
+ if (broadcast) {
+ hints += "broadcast"
}
+
+ if (hints.isEmpty) "none" else hints.mkString("(", ", ", ")")
--- End diff --
now when users run `EXPLAIN COST`, the displayed statistics will be
something like `Statistics(sizeInBytes=800.0 B, hints=(broadcast)`
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