dongjoon-hyun commented on issue #27834: [SPARK-31091] Revert SPARK-24640 Return `NULL` from `size(NULL)` by default URL: https://github.com/apache/spark/pull/27834#issuecomment-598550554 Since it has already `legacy` in the name, `spark.sql.legacy.sizeOfNull`, `true` just means preserving the old behavior, whatever it was. So, in that sense, the current name is also okay.
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