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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