utilize typed string instead of cast

Author: maxcountryman

src/parser.rs

@@ -194,11 +194,15 @@ impl Parser {
         // expression that should parse as the column name "date".
         if let Some(parsed) = self.maybe_parse(|parser| match parser.parse_data_type()? {
             DataType::Interval => parser.parse_literal_interval(),
-            data_type => Ok(Expr::Cast {
-                expr: Box::new(Expr::Value(Value::SingleQuotedString(
-                    parser.parse_literal_string()?,
-                ))),
+            // Single-quoted strings are parsed as custom data types, however this not desirable
+            // when we are handling input like `"NOT 'a' NOT LIKE 'b'"` because this will produce a
+            // TypedString instead of a SingleQuotedString. Further, this leads to issues where the
+            // same input will yield a BinaryOperator instead of the correct UnaryOperator. Here we
+            // handle that specific case by returning an error.
+            DataType::Custom(..) => Err(ParserError::ParserError("".to_string())),
+            data_type => Ok(Expr::TypedString {
                 data_type,
+                value: parser.parse_literal_string()?,
             }),
         }) {
             return Ok(parsed);