Github user viirya commented on a diff in the pull request:

    https://github.com/apache/spark/pull/23054#discussion_r234576450
  
    --- 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 LEGACY_ALIAS_NON_STRUCT_GROUPING_KEY =
    +    buildConf("spark.sql.legacy.dataset.aliasNonStructGroupingKey")
    --- End diff --
    
    Ok. That makes sense. Thanks.


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