cloud-fan commented on code in PR #49208:
URL: https://github.com/apache/spark/pull/49208#discussion_r1887850992
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -73,6 +73,21 @@ abstract class Optimizer(catalogManager: CatalogManager)
conf.optimizerMaxIterations,
maxIterationsSetting = SQLConf.OPTIMIZER_MAX_ITERATIONS.key)
+ /**
+ * A helper method that takes as input a Seq of Batch or Seq[Batch], and
flattens it out.
+ */
+ def flattenBatches(nestedBatchSequence: Seq[Any]): Seq[Batch] = {
+ assert(!Utils.isTesting || nestedBatchSequence.forall {
Review Comment:
Shall we remove `!Utils.isTesting`? The system will crash anyway if the
`Seq[Batch]` contains things other than `Batch`.
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