Add Postgres operators for the LIKE expression variants (#1096)

Author: gruuya

src/ast/operator.rs

@@ -131,6 +131,14 @@ pub enum BinaryOperator {
     PGRegexNotMatch,
     /// String does not match regular expression (case insensitively), e.g. `a !~* b` (PostgreSQL-specific)
     PGRegexNotIMatch,
+    /// String matches pattern (case sensitively), e.g. `a ~~ b` (PostgreSQL-specific)
+    PGLikeMatch,
+    /// String matches pattern (case insensitively), e.g. `a ~~* b` (PostgreSQL-specific)
+    PGILikeMatch,
+    /// String does not match pattern (case sensitively), e.g. `a !~~ b` (PostgreSQL-specific)
+    PGNotLikeMatch,
+    /// String does not match pattern (case insensitively), e.g. `a !~~* b` (PostgreSQL-specific)
+    PGNotILikeMatch,
     /// String "starts with", eg: `a ^@ b` (PostgreSQL-specific)
     PGStartsWith,
     /// PostgreSQL-specific custom operator.
@@ -174,6 +182,10 @@ impl fmt::Display for BinaryOperator {
             BinaryOperator::PGRegexIMatch => f.write_str("~*"),
             BinaryOperator::PGRegexNotMatch => f.write_str("!~"),
             BinaryOperator::PGRegexNotIMatch => f.write_str("!~*"),
+            BinaryOperator::PGLikeMatch => f.write_str("~~"),
+            BinaryOperator::PGILikeMatch => f.write_str("~~*"),
+            BinaryOperator::PGNotLikeMatch => f.write_str("!~~"),
+            BinaryOperator::PGNotILikeMatch => f.write_str("!~~*"),
             BinaryOperator::PGStartsWith => f.write_str("^@"),
             BinaryOperator::PGCustomBinaryOperator(idents) => {
                 write!(f, "OPERATOR({})", display_separated(idents, "."))

src/parser/mod.rs

@@ -2205,6 +2205,10 @@ impl<'a> Parser<'a> {
             Token::TildeAsterisk => Some(BinaryOperator::PGRegexIMatch),
             Token::ExclamationMarkTilde => Some(BinaryOperator::PGRegexNotMatch),
             Token::ExclamationMarkTildeAsterisk => Some(BinaryOperator::PGRegexNotIMatch),
+            Token::DoubleTilde => Some(BinaryOperator::PGLikeMatch),
+            Token::DoubleTildeAsterisk => Some(BinaryOperator::PGILikeMatch),
+            Token::ExclamationMarkDoubleTilde => Some(BinaryOperator::PGNotLikeMatch),
+            Token::ExclamationMarkDoubleTildeAsterisk => Some(BinaryOperator::PGNotILikeMatch),
             Token::Word(w) => match w.keyword {
                 Keyword::AND => Some(BinaryOperator::And),
                 Keyword::OR => Some(BinaryOperator::Or),
@@ -2620,6 +2624,10 @@ impl<'a> Parser<'a> {
             | Token::TildeAsterisk
             | Token::ExclamationMarkTilde
             | Token::ExclamationMarkTildeAsterisk
+            | Token::DoubleTilde
+            | Token::DoubleTildeAsterisk
+            | Token::ExclamationMarkDoubleTilde
+            | Token::ExclamationMarkDoubleTildeAsterisk
             | Token::Spaceship => Ok(20),
             Token::Pipe => Ok(21),
             Token::Caret | Token::Sharp | Token::ShiftRight | Token::ShiftLeft => Ok(22),

src/tokenizer.rs

@@ -149,6 +149,14 @@ pub enum Token {
     ExclamationMarkTilde,
     /// `!~*` , a case insensitive not match regular expression operator in PostgreSQL
     ExclamationMarkTildeAsterisk,
+    /// `~~`, a case sensitive match pattern operator in PostgreSQL
+    DoubleTilde,
+    /// `~~*`, a case insensitive match pattern operator in PostgreSQL
+    DoubleTildeAsterisk,
+    /// `!~~`, a case sensitive not match pattern operator in PostgreSQL
+    ExclamationMarkDoubleTilde,
+    /// `!~~*`, a case insensitive not match pattern operator in PostgreSQL
+    ExclamationMarkDoubleTildeAsterisk,
     /// `<<`, a bitwise shift left operator in PostgreSQL
     ShiftLeft,
     /// `>>`, a bitwise shift right operator in PostgreSQL
@@ -249,6 +257,10 @@ impl fmt::Display for Token {
             Token::TildeAsterisk => f.write_str("~*"),
             Token::ExclamationMarkTilde => f.write_str("!~"),
             Token::ExclamationMarkTildeAsterisk => f.write_str("!~*"),
+            Token::DoubleTilde => f.write_str("~~"),
+            Token::DoubleTildeAsterisk => f.write_str("~~*"),
+            Token::ExclamationMarkDoubleTilde => f.write_str("!~~"),
+            Token::ExclamationMarkDoubleTildeAsterisk => f.write_str("!~~*"),
             Token::AtSign => f.write_str("@"),
             Token::CaretAt => f.write_str("^@"),
             Token::ShiftLeft => f.write_str("<<"),
@@ -903,6 +915,16 @@ impl<'a> Tokenizer<'a> {
                             match chars.peek() {
                                 Some('*') => self
                                     .consume_and_return(chars, Token::ExclamationMarkTildeAsterisk),
+                                Some('~') => {
+                                    chars.next();
+                                    match chars.peek() {
+                                        Some('*') => self.consume_and_return(
+                                            chars,
+                                            Token::ExclamationMarkDoubleTildeAsterisk,
+                                        ),
+                                        _ => Ok(Some(Token::ExclamationMarkDoubleTilde)),
+                                    }
+                                }
                                 _ => Ok(Some(Token::ExclamationMarkTilde)),
                             }
                         }
@@ -974,6 +996,15 @@ impl<'a> Tokenizer<'a> {
                     chars.next(); // consume
                     match chars.peek() {
                         Some('*') => self.consume_and_return(chars, Token::TildeAsterisk),
+                        Some('~') => {
+                            chars.next();
+                            match chars.peek() {
+                                Some('*') => {
+                                    self.consume_and_return(chars, Token::DoubleTildeAsterisk)
+                                }
+                                _ => Ok(Some(Token::DoubleTilde)),
+                            }
+                        }
                         _ => Ok(Some(Token::Tilde)),
                     }
                 }
@@ -1994,6 +2025,44 @@ mod tests {
         compare(expected, tokens);
     }
 
+    #[test]
+    fn tokenize_pg_like_match() {
+        let sql = "SELECT col ~~ '_a%', col ~~* '_a%', col !~~ '_a%', col !~~* '_a%'";
+        let dialect = GenericDialect {};
+        let tokens = Tokenizer::new(&dialect, sql).tokenize().unwrap();
+        let expected = vec![
+            Token::make_keyword("SELECT"),
+            Token::Whitespace(Whitespace::Space),
+            Token::make_word("col", None),
+            Token::Whitespace(Whitespace::Space),
+            Token::DoubleTilde,
+            Token::Whitespace(Whitespace::Space),
+            Token::SingleQuotedString("_a%".into()),
+            Token::Comma,
+            Token::Whitespace(Whitespace::Space),
+            Token::make_word("col", None),
+            Token::Whitespace(Whitespace::Space),
+            Token::DoubleTildeAsterisk,
+            Token::Whitespace(Whitespace::Space),
+            Token::SingleQuotedString("_a%".into()),
+            Token::Comma,
+            Token::Whitespace(Whitespace::Space),
+            Token::make_word("col", None),
+            Token::Whitespace(Whitespace::Space),
+            Token::ExclamationMarkDoubleTilde,
+            Token::Whitespace(Whitespace::Space),
+            Token::SingleQuotedString("_a%".into()),
+            Token::Comma,
+            Token::Whitespace(Whitespace::Space),
+            Token::make_word("col", None),
+            Token::Whitespace(Whitespace::Space),
+            Token::ExclamationMarkDoubleTildeAsterisk,
+            Token::Whitespace(Whitespace::Space),
+            Token::SingleQuotedString("_a%".into()),
+        ];
+        compare(expected, tokens);
+    }
+
     #[test]
     fn tokenize_quoted_identifier() {
         let sql = r#" "a "" b" "a """ "c """"" "#;

tests/sqlparser_postgres.rs

@@ -1804,6 +1804,28 @@ fn parse_pg_regex_match_ops() {
     }
 }
 
+#[test]
+fn parse_pg_like_match_ops() {
+    let pg_like_match_ops = &[
+        ("~~", BinaryOperator::PGLikeMatch),
+        ("~~*", BinaryOperator::PGILikeMatch),
+        ("!~~", BinaryOperator::PGNotLikeMatch),
+        ("!~~*", BinaryOperator::PGNotILikeMatch),
+    ];
+
+    for (str_op, op) in pg_like_match_ops {
+        let select = pg().verified_only_select(&format!("SELECT 'abc' {} 'a_c%'", &str_op));
+        assert_eq!(
+            SelectItem::UnnamedExpr(Expr::BinaryOp {
+                left: Box::new(Expr::Value(Value::SingleQuotedString("abc".into()))),
+                op: op.clone(),
+                right: Box::new(Expr::Value(Value::SingleQuotedString("a_c%".into()))),
+            }),
+            select.projection[0]
+        );
+    }
+}
+
 #[test]
 fn parse_array_index_expr() {
     let num: Vec<Expr> = (0..=10)