Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/15189#discussion_r80406261
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/InMemoryRelation.scala
---
@@ -44,6 +44,70 @@ object InMemoryRelation {
new InMemoryRelation(child.output, useCompression, batchSize,
storageLevel, child, tableName)()
}
+/**
+ * Accumulator for storing column stats. Summarizes the data in the driver
to curb the amount of
+ * memory being used. Only "sizeInBytes" for each column is kept.
+ */
+class ColStatsAccumulator(originalOutput: Seq[Attribute])
--- End diff --
Should we make the class name explicitly say that it is for sizeInBytes?
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