ryanschneider commented on code in PR #1927:
URL: 
https://github.com/apache/datafusion-sqlparser-rs/pull/1927#discussion_r2198853680


##########
src/dialect/mod.rs:
##########
@@ -1076,6 +1088,15 @@ pub trait Dialect: Debug + Any {
     fn supports_comma_separated_drop_column_list(&self) -> bool {
         false
     }
+
+    /// Returns true if the dialect supports the passed in alias.
+    /// See [IsNotNullAlias].
+    fn supports_is_not_null_alias(&self, alias: IsNotNullAlias) -> bool {

Review Comment:
   Hmm, I made the change but now some of the `CREATE TABLE` tests are failing 
around the `IsNotNull` column options, so I think I broke something w/ 
precedence afterall so need to take a closer look at the parsing.



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