iffyio commented on code in PR #1653:
URL: 
https://github.com/apache/datafusion-sqlparser-rs/pull/1653#discussion_r1918901599


##########
src/ast/query.rs:
##########
@@ -328,6 +328,10 @@ pub struct Select {
     pub value_table_mode: Option<ValueTableMode>,
     /// STARTING WITH .. CONNECT BY
     pub connect_by: Option<ConnectBy>,
+    /// Hive syntax: `SELECT ... GROUP BY .. GROUPING SETS`
+    ///
+    /// 
[Hive](https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=30151323#EnhancedAggregation,Cube,GroupingandRollup-GROUPINGSETSclause)
+    pub grouping_sets: Option<Expr>,

Review Comment:
   I'm wondering is it possible to cover the lacking cases using the `group_by` 
property vs introducing a new property? Its not currently clear to me why a new 
field was introduced.



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