Fix parser for BigDecimal values

Author: Agaev Huseyn

src/parser/mod.rs

@@ -7277,10 +7277,16 @@ impl<'a> Parser<'a> {
             tok @ Token::Minus | tok @ Token::Plus => {
                 let next_token = self.next_token();
                 match next_token.token {
-                    Token::Number(n, l) => Ok(Value::Number(
-                        Self::parse::<String>(tok.to_string() + &n, location)?,
-                        l,
-                    )),
+                    Token::Number(n, l) => {
+                        if tok == Token::Minus {
+                            Ok(Value::Number(
+                                Self::parse(tok.to_string() + &n, location)?,
+                                l,
+                            ))
+                        } else {
+                            Ok(Value::Number(Self::parse(n, location)?, l))
+                        }
+                    }
                     _ => self.expected("number", next_token),
                 }
             }

tests/sqlparser_common.rs

@@ -2838,7 +2838,7 @@ fn parse_signed_value() {
     START WITH +   45";
     one_statement_parses_to(
         sql2,
-        "CREATE SEQUENCE name2 AS BIGINT INCREMENT +10 MINVALUE +30 MAXVALUE +5000 START WITH +45",
+        "CREATE SEQUENCE name2 AS BIGINT INCREMENT 10 MINVALUE 30 MAXVALUE 5000 START WITH 45",
     );
 }