From 5949a5d9fffabc925a9176d27fe5eed83388c97e Mon Sep 17 00:00:00 2001
From: Roman Borschel <roman@cluvio.com>
Date: Wed, 9 Apr 2025 11:36:34 +0200
Subject: [PATCH] Allow literal backslash escape in Redshift dialect.

Redshift supports the literal backslash escape at least for a subset of
characters, including single quotes ('). This is unfortunately not
publicly documented (yet) but used in successful queries.
---
 src/dialect/redshift.rs     | 4 ++++
 tests/sqlparser_redshift.rs | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/src/dialect/redshift.rs b/src/dialect/redshift.rs
index d90eb6e7d..feccca5dd 100644
--- a/src/dialect/redshift.rs
+++ b/src/dialect/redshift.rs
@@ -125,4 +125,8 @@ impl Dialect for RedshiftSqlDialect {
     fn allow_extract_single_quotes(&self) -> bool {
         true
     }
+
+    fn supports_string_literal_backslash_escape(&self) -> bool {
+        true
+    }
 }
diff --git a/tests/sqlparser_redshift.rs b/tests/sqlparser_redshift.rs
index 060e3853d..be2b67223 100644
--- a/tests/sqlparser_redshift.rs
+++ b/tests/sqlparser_redshift.rs
@@ -397,3 +397,8 @@ fn parse_extract_single_quotes() {
     let sql = "SELECT EXTRACT('month' FROM my_timestamp) FROM my_table";
     redshift().verified_stmt(sql);
 }
+
+#[test]
+fn parse_string_literal_backslash_escape() {
+    redshift().one_statement_parses_to(r#"SELECT 'l\'auto'"#, "SELECT 'l''auto'");
+}