wugeer commented on code in PR #1472:
URL: 
https://github.com/apache/datafusion-sqlparser-rs/pull/1472#discussion_r1807356535


##########
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:
   Good idea, I will try it. :)



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