Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/19952#discussion_r156550872
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/FilterEstimation.scala
---
@@ -574,51 +539,90 @@ case class FilterEstimation(plan: Filter) extends
Logging {
}
/**
- * Returns the selectivity percentage for binary condition in the
column's
- * current valid range [min, max]
- *
- * @param op a binary comparison operator
- * @param histogram a numeric equi-height histogram
- * @param max the upper bound of the current valid range for a given
column
- * @param min the lower bound of the current valid range for a given
column
- * @param datumNumber the numeric value of a literal
- * @return the selectivity percentage for a condition in the current
range.
+ * Computes the possibility of a equal predicate using histogram.
--- End diff --
nit: an equality predicate
---
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