shahidki31 commented on a change in pull request #32494:
URL: https://github.com/apache/spark/pull/32494#discussion_r631528684



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/FilterEstimation.scala
##########
@@ -225,7 +225,7 @@ case class FilterEstimation(plan: Filter) extends Logging {
       attr: Attribute,
       isNull: Boolean,
       update: Boolean): Option[Double] = {
-    if (!colStatsMap.contains(attr) || !colStatsMap(attr).hasCountStats) {
+    if (!colStatsMap.contains(attr) || colStatsMap(attr).nullCount.isEmpty) {

Review comment:
       Ideally this method doesn't require `distinctCount`. Union operator 
doesn't return `distinctCount`, but it can return `nullCount`. 




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