Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/4783#discussion_r25969222
--- Diff: core/src/main/scala/org/apache/spark/util/SizeEstimator.scala ---
@@ -257,21 +262,56 @@ private[spark] object SizeEstimator extends Logging {
val parent = getClassInfo(cls.getSuperclass)
var shellSize = parent.shellSize
var pointerFields = parent.pointerFields
+
+ // we have only four sizes: 1, 2, 4, 8. pointerSize can be 4 or 8.
--- End diff --
I don't think you need this comment. Its pretty self explanatory that we
are counting how many times each fieldSize + pointers occur
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