iffyio commented on code in PR #1472:
URL: 
https://github.com/apache/datafusion-sqlparser-rs/pull/1472#discussion_r1817990993


##########
src/parser/mod.rs:
##########
@@ -1174,6 +1175,14 @@ impl<'a> Parser<'a> {
                     ),
                 })
             }
+            Token::ExclamationMark if 
!self.dialect.supports_factorial_operator() => {

Review Comment:
   Similarly, this comment looks unadressed? The new feature ideally has its 
own `dialect` method. Otherwise it can get complicated to try to infer when a 
feature should take precedence



##########
tests/sqlparser_hive.rs:
##########
@@ -537,6 +537,33 @@ fn parse_use() {
     );
 }
 
+#[test]
+fn parse_hive_unary_ops() {

Review Comment:
   The test comments are also unadressed?



##########
src/parser/mod.rs:
##########
@@ -2796,9 +2811,27 @@ impl<'a> Parser<'a> {
                 format: None,
             })
         } else if Token::ExclamationMark == tok {
-            // PostgreSQL factorial operation
+            match expr {
+                Expr::Value(_) | Expr::Identifier(_) => {
+                    if !self.dialect.supports_factorial_operator() {
+                        return parser_err!(
+                            format!(
+                                "current dialect: {:?} does not support 
factorial operator",
+                                self.dialect
+                            ),
+                            self.peek_token().location
+                        );
+                    }
+                }
+                _ => {}
+            };
+            let op = if !self.dialect.supports_factorial_operator() {
+                UnaryOperator::SpecialNot
+            } else {
+                UnaryOperator::PGPostfixFactorial
+            };

Review Comment:
   I think this isn't fully implemented yet? we still have the match expr which 
we'd want to avoid



##########
src/ast/operator.rs:
##########
@@ -51,6 +51,8 @@ pub enum UnaryOperator {
     PGPrefixFactorial,
     /// Absolute value, e.g. `@ -9` (PostgreSQL-specific)
     PGAbs,
+    /// Special Not, e.g. `! false` (Hive-specific)
+    SpecialNot,

Review Comment:
   This comment is unadressed? (in that the PR still uses 'special not')



##########
src/parser/mod.rs:
##########
@@ -1074,6 +1074,7 @@ impl<'a> Parser<'a> {
                     }))
                 }
                 Keyword::NOT => self.parse_not(),
+

Review Comment:
   ```suggestion
   ```



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