Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/19295#discussion_r140624028
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkOptimizer.scala ---
@@ -28,12 +28,18 @@ class SparkOptimizer(
experimentalMethods: ExperimentalMethods)
extends Optimizer(catalog) {
- override def batches: Seq[Batch] = (preOptimizationBatches ++
super.batches :+
+ val experimentalPreOptimizations: Seq[Batch] = Seq(Batch(
--- End diff --
also define this as `Batch` and you can use `experimentalPreOptimizations
+: preOptimizationBatches` to concatenate with other batches.
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