Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17415#discussion_r109099018
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/FilterEstimation.scala
---
@@ -550,6 +565,140 @@ case class FilterEstimation(plan: Filter,
catalystConf: CatalystConf) extends Lo
Some(percent.toDouble)
}
+ /**
+ * Returns a percentage of rows meeting a binary comparison expression
containing two columns.
+ * In SQL queries, we also see predicate expressions involving two
columns
+ * such as "column-1 (op) column-2" where column-1 and column-2 belong
to same table.
+ * Note that, if column-1 and column-2 belong to different tables, then
it is a join
+ * operator's work, NOT a filter operator's work.
+ *
+ * @param op a binary comparison operator such as =, <, <=, >, >=
--- End diff --
How about giving a complete list? Could you update the other functions too?
// @param op a binary comparison operator, including =, <, <=, >, >=, <=>
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