cfmcgrady commented on a change in pull request #33142:
URL: https://github.com/apache/spark/pull/33142#discussion_r662909946
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/EquivalentExpressions.scala
##########
@@ -93,25 +72,33 @@ class EquivalentExpressions {
*/
private def addCommonExprs(
exprs: Seq[Expression],
- addFunc: Expression => Boolean = addExpr): Unit = {
- val exprSetForAll = mutable.Set[Expr]()
- addExprTree(exprs.head, addExprToSet(_, exprSetForAll))
-
- val candidateExprs = exprs.tail.foldLeft(exprSetForAll) { (exprSet, expr)
=>
- val otherExprSet = mutable.Set[Expr]()
- addExprTree(expr, addExprToSet(_, otherExprSet))
- exprSet.intersect(otherExprSet)
+ map: mutable.HashMap[ExpressionEquals, ExpressionStats]): Unit = {
+ assert(exprs.length > 1)
+ var localEquivalenceMap = mutable.HashMap.empty[ExpressionEquals,
ExpressionStats]
Review comment:
This also fixed that, previously, for `Or(Coalesce(expr1, expr2, expr2),
Coalesce(expr1, expr2, expr2))`, `expr2` will be extracted and considered as a
common subexpression. Currently, no subexpression will be extracted.
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