cloud-fan commented on a change in pull request #27066:
URL: https://github.com/apache/spark/pull/27066#discussion_r448719959
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
##########
@@ -1788,3 +1791,22 @@ object OptimizeLimitZero extends Rule[LogicalPlan] {
empty(ll)
}
}
+
+/**
+ * Combines all adjacent [[WithFields]] expression into a single
[[WithFields]] expression.
+ */
+object CombineWithFields extends Rule[LogicalPlan] {
Review comment:
nit: `optimizer.scala` is very big now. Can we create a
`withFields.scala` and put these 2 new rules there?
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