Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19594#discussion_r157517120
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/JoinEstimation.scala
---
@@ -225,6 +236,43 @@ case class JoinEstimation(join: Join) extends Logging {
(ceil(card), newStats)
}
+ /** Compute join cardinality using equi-height histograms. */
+ private def computeByEquiHeightHistogram(
--- End diff --
I think it's ok to only say `Histogram` in method names and explain it's
equi-height in comments.
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