Support the string concat operator

Author: Dandandan

src/tokenizer.rs

@@ -380,14 +380,12 @@ impl<'a> Tokenizer<'a> {
                 '|' => {
                     chars.next(); // consume the '|'
                     match chars.peek() {
-                        Some('|') => {
-                            self.consume_and_return(chars, Token::StringConcat)
-                        }
+                        Some('|') => self.consume_and_return(chars, Token::StringConcat),
                         // a regular '/' operator
                         _ => Err(TokenizerError(format!(
                             "Tokenizer Error at Line: {}, Col: {}",
                             self.line, self.col
-                        )))
+                        ))),
                     }
                 }
                 '=' => self.consume_and_return(chars, Token::Eq),

tests/sqlparser_common.rs

@@ -671,19 +671,15 @@ fn parse_string_agg() {
 
     let select = verified_only_select(sql);
     assert_eq!(
-        SelectItem::UnnamedExpr(
-            Expr::BinaryOp {
-                left: Box::new(Expr::Identifier(Ident::new("a"))),
-                op: BinaryOperator::StringConcat,
-                right: Box::new(Expr::Identifier(Ident::new("b"))),
-            }
-        ),
+        SelectItem::UnnamedExpr(Expr::BinaryOp {
+            left: Box::new(Expr::Identifier(Ident::new("a"))),
+            op: BinaryOperator::StringConcat,
+            right: Box::new(Expr::Identifier(Ident::new("b"))),
+        }),
         select.projection[0]
     );
-
 }
 
-
 #[test]
 fn parse_between() {
     fn chk(negated: bool) {