Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/21598#discussion_r198364343 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala --- @@ -1324,6 +1324,12 @@ object SQLConf { "Other column values can be ignored during parsing even if they are malformed.") .booleanConf .createWithDefault(true) + + val LEGACY_SIZE_OF_NULL = buildConf("spark.sql.legacy.sizeOfNull") + .doc("If it is set to true, size of null returns -1. This behavior was inherited from Hive. " + + "The size function returns null for null input if the flag is disabled.") --- End diff -- perhaps you should say this will be updated to false in spark 3.0?
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