PokIsemaine commented on code in PR #1724:
URL: 
https://github.com/apache/datafusion-sqlparser-rs/pull/1724#discussion_r1955494712


##########
src/ast/query.rs:
##########
@@ -2205,31 +2205,50 @@ pub enum JoinConstraint {
 #[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
-pub struct OrderBy {
-    pub exprs: Vec<OrderByExpr>,
-    /// Optional: `INTERPOLATE`
-    /// Supported by [ClickHouse syntax]
+pub enum OrderBy {

Review Comment:
   This is worth considering, `ORDER BY ALL` supports `ASC`, `DSC`, but `FILL` 
and `INTERPOLATE` are not supported in `ClickHouse`.
   [ORDER BY ALL WITH FILL 
playground](https://sql.clickhouse.com?query=U0VMRUNUIG51bWJlciBhcyBrZXksIDUgKiBudW1iZXIgdmFsdWUsICdvcmlnaW5hbCcgQVMgc291cmNlCkZST00gbnVtYmVycygxNikgV0hFUkUga2V5ICUgNSA9PSAwCk9SREVSIEJZIEFMTCBXSVRIIEZJTEw7&chart=eyJ0eXBlIjoibGluZSIsImNvbmZpZyI6eyJ4YXhpcyI6InllYXIiLCJ5YXhpcyI6Ijk5dGhfYXZnX3RlbXAiLCJzZXJpZXMiOiJjb3VudHJ5IiwidGl0bGUiOiJUZW1wZXJhdHVyZSBieSBjb3VudHJ5IGFuZCB5ZWFyIn19&;)
   [ORDER BY ALL WITH INTERPOLATE 
playground](https://sql.clickhouse.com?query=U0VMRUNUIG4sIHNvdXJjZSwgaW50ZXIgRlJPTSAoCiAgIFNFTEVDVCB0b0Zsb2F0MzIobnVtYmVyICUgMTApIEFTIG4sICdvcmlnaW5hbCcgQVMgc291cmNlLCBudW1iZXIgYXMgaW50ZXIKICAgRlJPTSBudW1iZXJzKDEwKSBXSEVSRSBudW1iZXIgJSAzID0gMQopIE9SREVSIEJZIEFMTCBXSVRIIEZJTEwgRlJPTSAwIFRPIDUuNTEgU1RFUCAwLjUgSU5URVJQT0xBVEUgKGludGVyIEFTIGludGVyICsgMSk7&chart=eyJ0eXBlIjoibGluZSIsImNvbmZpZyI6eyJ4YXhpcyI6InllYXIiLCJ5YXhpcyI6Ijk5dGhfYXZnX3RlbXAiLCJzZXJpZXMiOiJjb3VudHJ5IiwidGl0bGUiOiJUZW1wZXJhdHVyZSBieSBjb3VudHJ5IGFuZCB5ZWFyIn19&;)



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