[GitHub] [spark] wangyum commented on a diff in pull request #40093: [SPARK-42500][SQL] ConstantPropagation supports more cases

["wangyum (via GitHub)" <gi...@apache.org>]

wangyum commented on code in PR #40093:
URL: https://github.com/apache/spark/pull/40093#discussion_r1121025032


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala:
##########
@@ -200,14 +200,20 @@ object ConstantPropagation extends Rule[LogicalPlan] {
 
   private def replaceConstants(condition: Expression, equalityPredicates: EqualityPredicates)
     : Expression = {
-    val constantsMap = AttributeMap(equalityPredicates.map(_._1))
-    val predicates = equalityPredicates.map(_._2).toSet
-    def replaceConstants0(expression: Expression) = expression transform {
+    val allConstantsMap = AttributeMap(equalityPredicates.map(_._1))
+    val allPredicates = equalityPredicates.map(_._2).toSet
+    def replaceConstants0(
+        expression: Expression, constantsMap: AttributeMap[Literal]) = expression transform {
       case a: AttributeReference => constantsMap.getOrElse(a, a)
     }
     condition transform {
-      case e @ EqualTo(_, _) if !predicates.contains(e) => replaceConstants0(e)
-      case e @ EqualNullSafe(_, _) if !predicates.contains(e) => replaceConstants0(e)
+      case b: BinaryComparison =>

Review Comment:
   cc @peter-toth 



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