dongjoon-hyun commented on a change in pull request #26016: [SPARK-24914][SQL]
New statistic to improve data size estimate for columnar storage formats
URL: https://github.com/apache/spark/pull/26016#discussion_r388008410
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala
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@@ -439,14 +446,18 @@ case class CatalogStatistics(
} else {
// When plan statistics are disabled or the table doesn't have other
statistics,
// we apply the size-only estimation strategy and only propagate
sizeInBytes in statistics.
- Statistics(sizeInBytes = sizeInBytes)
+ val size = deserFactor.map { factor =>
+ BigInt(roundToBigInteger(sizeInBytes.doubleValue *
deserFactorDistortion * factor, UP))
Review comment:
Do we need to use `roundToBigInteger`? Any other workaround?
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