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Ignore escaped LIKE wildcards in MySQL (#1735)

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Michael Victor Zink 2025-02-28 22:07:39 -08:00 • committed by GitHub
parent ed416548dc
commit a629ddf89b
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5 changed files with 89 additions and 15 deletions
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22
src/tokenizer.rs
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@ -2011,8 +2011,13 @@ impl<'a> Tokenizer<'a> {
num_consecutive_quotes = 0;
if let Some(next) = chars.peek() {
if !self.unescape {
// In no-escape mode, the given query has to be saved completely including backslashes.
if !self.unescape
|| (self.dialect.ignores_wildcard_escapes()
&& (*next == '%' || *next == '_'))
{
// In no-escape mode, the given query has to be saved completely
// including backslashes. Similarly, with ignore_like_wildcard_escapes,
// the backslash is not stripped.
s.push(ch);
s.push(*next);
chars.next(); // consume next
@ -3585,6 +3590,9 @@ mod tests {
(r#"'\\a\\b\'c'"#, r#"\\a\\b\'c"#, r#"\a\b'c"#),
(r#"'\'abcd'"#, r#"\'abcd"#, r#"'abcd"#),
(r#"'''a''b'"#, r#"''a''b"#, r#"'a'b"#),
(r#"'\q'"#, r#"\q"#, r#"q"#),
(r#"'\%\_'"#, r#"\%\_"#, r#"%_"#),
(r#"'\\%\\_'"#, r#"\\%\\_"#, r#"\%\_"#),
] {
let tokens = Tokenizer::new(&dialect, sql)
.with_unescape(false)
@ -3618,6 +3626,16 @@ mod tests {
compare(expected, tokens);
}
// MySQL special case for LIKE escapes
for (sql, expected) in [(r#"'\%'"#, r#"\%"#), (r#"'\_'"#, r#"\_"#)] {
let dialect = MySqlDialect {};
let tokens = Tokenizer::new(&dialect, sql).tokenize().unwrap();
let expected = vec![Token::SingleQuotedString(expected.to_string())];
compare(expected, tokens);
}
}
#[test]