maropu commented on a change in pull request #29075:
URL: https://github.com/apache/spark/pull/29075#discussion_r454001849



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
##########
@@ -207,13 +207,15 @@ trait PredicateHelper extends Logging {
    * CNF can explode exponentially in the size of the input expression when 
converting [[Or]]
    * clauses. Use a configuration [[SQLConf.MAX_CNF_NODE_COUNT]] to prevent 
such cases.
    *
-   * @param condition to be converted into CNF.
+   * @param condition Condition to be converted into CNF.
+   * @param groupExpsFunc A method for grouping intermediate results so that 
the final result can be
+   *                      shorter.

Review comment:
       `A method to group expressions for reducing the size of pushed down 
predicates and corresponding codegen`?




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