Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/23054#discussion_r235238609 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala --- @@ -1594,6 +1594,15 @@ object SQLConf { "WHERE, which does not follow SQL standard.") .booleanConf .createWithDefault(false) + + val ALIAS_NON_STRUCT_GROUPING_KEY_AS_VALUE = + buildConf("spark.sql.legacy.dataset.aliasNonStructGroupingKeyAsValue") + .internal() + .doc("When set to true, the key attribute resulted from running `Dataset.groupByKey` " + + "for non-struct key type, will be named as `value`, following the behavior of Spark " + --- End diff -- so it's "named" as value, not "alias" to value. I think it's more precise to call this config `spark.sql.legacy.dataset.nameNonStructGroupingKeyAsValue`?
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