Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/8604#discussion_r39253221
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/columnar/InMemoryColumnarTableScan.scala
---
@@ -268,16 +268,21 @@ private[sql] case class InMemoryColumnarTableScan(
readBatches.setValue(0)
}
- relation.cachedColumnBuffers.mapPartitions { cachedBatchIterator =>
- val partitionFilter = newPredicate(
- partitionFilters.reduceOption(And).getOrElse(Literal(true)),
- relation.partitionStatistics.schema)
+ val schema = relation.partitionStatistics.schema
+ val schemaIndex = schema.zipWithIndex
+ val relOutput = relation.output
+ val buffers = relation.cachedColumnBuffers
--- End diff --
Could you please add a comment above this hunk to indicate that these
variables are added to avoid unnecessary serialization?
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