attilapiros commented on issue #26016: [SPARK-24914][SQL] New statistic to improve data size estimate for columnar storage formats URL: https://github.com/apache/spark/pull/26016#issuecomment-581947915 I have cut this PR into two parts. The first part contains introducing `deserFactor` as a table property and using its value for estimating the data size: https://github.com/apache/spark/pull/27453
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