Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/19783#discussion_r153973342
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/FilterEstimation.scala
---
@@ -471,37 +508,47 @@ case class FilterEstimation(plan: Filter) extends
Logging {
percent = 1.0
} else {
--- End diff --
`else if (colStat.histogram.isEmpty)`
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