iffyio commented on code in PR #1579:
URL: 
https://github.com/apache/datafusion-sqlparser-rs/pull/1579#discussion_r1871558793


##########
src/parser/mod.rs:
##########
@@ -7273,6 +7273,10 @@ impl<'a> Parser<'a> {
                 let if_exists = self.parse_keywords(&[Keyword::IF, 
Keyword::EXISTS]);
                 let name = self.parse_identifier(false)?;
                 AlterTableOperation::DropProjection { if_exists, name }
+            } else if dialect_of!(self is SnowflakeDialect | GenericDialect)
+                && self.parse_keywords(&[Keyword::CLUSTERING, Keyword::KEY])

Review Comment:
   for the gating can we use a method on the dialect trait in place of the 
`dialect_of!`? I'm thinking as well if it would make sense to one method to 
represent these options since they belong to the same feature , e.g. 
`supports_alter_table_clustering_action()` or similar method?



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