sql_parser: update statement parser implemented

Author: Almaz-KG

src/parser/update/mod.rs

@@ -46,7 +46,7 @@ impl<'a> UpdateStatementParser for Parser<'a> {
             } else {
                 return Err(ParsingError::UnexpectedToken(format!(
                     "Expected ON CONFLICT keyword, got: {}",
-                    self.peek_token()?.to_string()
+                    self.peek_token()?
                 )));
             };
         }
@@ -80,10 +80,10 @@ impl<'a> UpdateStatementParser for Parser<'a> {
             }
             self.consume_as(TokenType::RightParen)?;
             self.consume_as(TokenType::Equals)?;
-            return Ok(SetClause::MultipleColumnAssignment(
+            Ok(SetClause::MultipleColumnAssignment(
                 ids,
                 self.parse_expression()?,
-            ));
+            ))
         } else {
             let id = self.parse_identifier()?;
             self.consume_as(TokenType::Equals)?;