Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21598#discussion_r197227370
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -1314,6 +1314,13 @@ 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")
--- End diff --
I've created https://issues.apache.org/jira/browse/SPARK-24625 to track it.
It's similar to
https://github.com/apache/spark/pull/21427#issuecomment-396142545 , but as I
replied in that PR, having version specific config is an overkill, while
`legacy` is simpler and more explicit that it will be removed in the future.
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