Support bitwise and, or, xor (#181)

Operator precedence is coming from:

https://cloud.google.com/bigquery/docs/reference/standard-sql/operators

src/ast/operator.rs

@@ -49,6 +49,9 @@ pub enum BinaryOperator {
     Or,
     Like,
     NotLike,
+    BitwiseOr,
+    BitwiseAnd,
+    BitwiseXor,
 }
 
 impl fmt::Display for BinaryOperator {
@@ -70,6 +73,9 @@ impl fmt::Display for BinaryOperator {
             BinaryOperator::Or => "OR",
             BinaryOperator::Like => "LIKE",
             BinaryOperator::NotLike => "NOT LIKE",
+            BinaryOperator::BitwiseOr => "|",
+            BinaryOperator::BitwiseAnd => "&",
+            BinaryOperator::BitwiseXor => "^",
         })
     }
 }

src/parser.rs

@@ -578,6 +578,9 @@ impl Parser {
             Token::Mult => Some(BinaryOperator::Multiply),
             Token::Mod => Some(BinaryOperator::Modulus),
             Token::StringConcat => Some(BinaryOperator::StringConcat),
+            Token::Pipe => Some(BinaryOperator::BitwiseOr),
+            Token::Caret => Some(BinaryOperator::BitwiseXor),
+            Token::Ampersand => Some(BinaryOperator::BitwiseAnd),
             Token::Div => Some(BinaryOperator::Divide),
             Token::Word(ref k) => match k.keyword.as_ref() {
                 "AND" => Some(BinaryOperator::And),
@@ -708,6 +711,9 @@ impl Parser {
                 Token::Eq | Token::Lt | Token::LtEq | Token::Neq | Token::Gt | Token::GtEq => {
                     Ok(20)
                 }
+                Token::Pipe => Ok(21),
+                Token::Caret => Ok(22),
+                Token::Ampersand => Ok(23),
                 Token::Plus | Token::Minus => Ok(Self::PLUS_MINUS_PREC),
                 Token::Mult | Token::Div | Token::Mod | Token::StringConcat => Ok(40),
                 Token::DoubleColon => Ok(50),

src/tokenizer.rs

@@ -84,8 +84,12 @@ pub enum Token {
     LBracket,
     /// Right bracket `]`
     RBracket,
-    /// Ampersand &
+    /// Ampersand `&`
     Ampersand,
+    /// Pipe `|`
+    Pipe,
+    /// Caret `^`
+    Caret,
     /// Left brace `{`
     LBrace,
     /// Right brace `}`
@@ -125,6 +129,8 @@ impl fmt::Display for Token {
             Token::LBracket => f.write_str("["),
             Token::RBracket => f.write_str("]"),
             Token::Ampersand => f.write_str("&"),
+            Token::Caret => f.write_str("^"),
+            Token::Pipe => f.write_str("|"),
             Token::LBrace => f.write_str("{"),
             Token::RBrace => f.write_str("}"),
         }
@@ -381,10 +387,8 @@ impl<'a> Tokenizer<'a> {
                     chars.next(); // consume the '|'
                     match chars.peek() {
                         Some('|') => self.consume_and_return(chars, Token::StringConcat),
-                        _ => Err(TokenizerError(format!(
+                        // Bitshift '|' operator
-                            "Expecting to see `||`. Bitwise or operator `|` is not supported. \nError at Line: {}, Col: {}",
+                        _ => Ok(Some(Token::Pipe)),
-                            self.line, self.col
-                        ))),
                     }
                 }
                 '=' => self.consume_and_return(chars, Token::Eq),
@@ -426,6 +430,7 @@ impl<'a> Tokenizer<'a> {
                 '[' => self.consume_and_return(chars, Token::LBracket),
                 ']' => self.consume_and_return(chars, Token::RBracket),
                 '&' => self.consume_and_return(chars, Token::Ampersand),
+                '^' => self.consume_and_return(chars, Token::Caret),
                 '{' => self.consume_and_return(chars, Token::LBrace),
                 '}' => self.consume_and_return(chars, Token::RBrace),
                 other => self.consume_and_return(chars, Token::Char(other)),
@@ -594,6 +599,29 @@ mod tests {
 
         compare(expected, tokens);
     }
+    #[test]
+    fn tokenize_bitwise_op() {
+        let sql = String::from("SELECT one | two ^ three");
+        let dialect = GenericDialect {};
+        let mut tokenizer = Tokenizer::new(&dialect, &sql);
+        let tokens = tokenizer.tokenize().unwrap();
+
+        let expected = vec![
+            Token::make_keyword("SELECT"),
+            Token::Whitespace(Whitespace::Space),
+            Token::make_word("one", None),
+            Token::Whitespace(Whitespace::Space),
+            Token::Pipe,
+            Token::Whitespace(Whitespace::Space),
+            Token::make_word("two", None),
+            Token::Whitespace(Whitespace::Space),
+            Token::Caret,
+            Token::Whitespace(Whitespace::Space),
+            Token::make_word("three", None),
+        ];
+
+        compare(expected, tokens);
+    }
 
     #[test]
     fn tokenize_simple_select() {

tests/sqlparser_common.rs

@@ -680,6 +680,27 @@ fn parse_string_agg() {
     );
 }
 
+#[test]
+fn parse_bitwise_ops() {
+    let bitwise_ops = &[
+        ("^", BinaryOperator::BitwiseXor),
+        ("|", BinaryOperator::BitwiseOr),
+        ("&", BinaryOperator::BitwiseAnd),
+    ];
+
+    for (str_op, op) in bitwise_ops {
+        let select = verified_only_select(&format!("SELECT a {} b", &str_op));
+        assert_eq!(
+            SelectItem::UnnamedExpr(Expr::BinaryOp {
+                left: Box::new(Expr::Identifier(Ident::new("a"))),
+                op: op.clone(),
+                right: Box::new(Expr::Identifier(Ident::new("b"))),
+            }),
+            select.projection[0]
+        );
+    }
+}
+
 #[test]
 fn parse_between() {
     fn chk(negated: bool) {