Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/14733#discussion_r77257778
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/InMemoryTableScanExec.scala
---
@@ -142,13 +171,16 @@ case class InMemoryTableScanExec(
val cachedBatchesToScan =
if (inMemoryPartitionPruningEnabled) {
cachedBatchIterator.filter { cachedBatch =>
+ val partitionFilter = newPredicate(
--- End diff --
Why did you choose to nest this more deeply inside of the `filter` rather
than leaving it where it was in `mapPartitionsInternal`? By moving it here,
we'll wind up calling `newPredicate` once per batch rather than once per
partition, thereby harming performance.
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