viirya commented on a change in pull request #30245:
URL: https://github.com/apache/spark/pull/30245#discussion_r518571332
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/EquivalentExpressions.scala
##########
@@ -65,11 +65,46 @@ class EquivalentExpressions {
}
}
+ /**
+ * Adds only expressions which are common in each of given expressions, in a
recursive way.
+ * For example, given two expressions `(a + (b + (c + 1)))` and `(d + (e +
(c + 1)))`,
+ * the common expression `(c + 1)` will be added into `equivalenceMap`.
+ */
+ def addCommonExprs(exprs: Seq[Expression], addFunc: Expression => Boolean =
addExpr): Unit = {
Review comment:
Sounds good.
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