From d9466f0391ba19e0691580225767adb6f90f5478 Mon Sep 17 00:00:00 2001
From: Petr Novotnik <petr.novotnik@mgm-tp.com>
Date: Sun, 14 Dec 2025 10:52:18 +0100
Subject: [PATCH] Guard quote delimited string by explicit dialect setting

---
 src/dialect/generic.rs    |  4 ++++
 src/dialect/mod.rs        |  7 +++++++
 src/dialect/oracle.rs     |  4 ++++
 src/tokenizer.rs          |  7 ++++---
 tests/sqlparser_oracle.rs | 26 +++++++++++++++++++-------
 5 files changed, 38 insertions(+), 10 deletions(-)

diff --git a/src/dialect/generic.rs b/src/dialect/generic.rs
index dffc5b52..bbedbc05 100644
--- a/src/dialect/generic.rs
+++ b/src/dialect/generic.rs
@@ -195,4 +195,8 @@ impl Dialect for GenericDialect {
     fn supports_interval_options(&self) -> bool {
         true
     }
+
+    fn supports_quote_delimited_string(&self) -> bool {
+        true
+    }
 }
diff --git a/src/dialect/mod.rs b/src/dialect/mod.rs
index 1d99d863..1a416e4d 100644
--- a/src/dialect/mod.rs
+++ b/src/dialect/mod.rs
@@ -1209,6 +1209,13 @@ pub trait Dialect: Debug + Any {
     fn supports_semantic_view_table_factor(&self) -> bool {
         false
     }
+
+    /// Support quote delimited string literals, e.g. `Q'{...}'`
+    ///
+    /// [Oracle](https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/Literals.html#GUID-1824CBAA-6E16-4921-B2A6-112FB02248DA)
+    fn supports_quote_delimited_string(&self) -> bool {
+        false
+    }
 }
 
 /// This represents the operators for which precedence must be defined
diff --git a/src/dialect/oracle.rs b/src/dialect/oracle.rs
index f8bb0e15..54c2ace5 100644
--- a/src/dialect/oracle.rs
+++ b/src/dialect/oracle.rs
@@ -95,4 +95,8 @@ impl Dialect for OracleDialect {
     fn supports_group_by_expr(&self) -> bool {
         true
     }
+
+    fn supports_quote_delimited_string(&self) -> bool {
+        true
+    }
 }
diff --git a/src/tokenizer.rs b/src/tokenizer.rs
index d11c2fcd..238bf233 100644
--- a/src/tokenizer.rs
+++ b/src/tokenizer.rs
@@ -40,11 +40,11 @@ use serde::{Deserialize, Serialize};
 #[cfg(feature = "visitor")]
 use sqlparser_derive::{Visit, VisitMut};
 
+use crate::dialect::Dialect;
 use crate::dialect::{
     BigQueryDialect, DuckDbDialect, GenericDialect, MySqlDialect, PostgreSqlDialect,
     SnowflakeDialect,
 };
-use crate::dialect::{Dialect, OracleDialect};
 use crate::keywords::{Keyword, ALL_KEYWORDS, ALL_KEYWORDS_INDEX};
 use crate::{
     ast::{DollarQuotedString, QuoteDelimitedString},
@@ -1043,7 +1043,8 @@ impl<'a> Tokenizer<'a> {
                                 self.tokenize_single_quoted_string(chars, '\'', backslash_escape)?;
                             Ok(Some(Token::NationalStringLiteral(s)))
                         }
-                        Some(&q @ 'q') | Some(&q @ 'Q') if dialect_of!(self is OracleDialect | GenericDialect) =>
+                        Some(&q @ 'q') | Some(&q @ 'Q')
+                            if self.dialect.supports_quote_delimited_string() =>
                         {
                             chars.next(); // consume and check the next char
                             if let Some('\'') = chars.peek() {
@@ -1061,7 +1062,7 @@ impl<'a> Tokenizer<'a> {
                         }
                     }
                 }
-                q @ 'Q' | q @ 'q' if dialect_of!(self is OracleDialect | GenericDialect) => {
+                q @ 'Q' | q @ 'q' if self.dialect.supports_quote_delimited_string() => {
                     chars.next(); // consume and check the next char
                     if let Some('\'') = chars.peek() {
                         self.tokenize_quote_delimited_string(chars, &[q])
diff --git a/tests/sqlparser_oracle.rs b/tests/sqlparser_oracle.rs
index 8a0d8721..ee5f209e 100644
--- a/tests/sqlparser_oracle.rs
+++ b/tests/sqlparser_oracle.rs
@@ -21,7 +21,10 @@
 use pretty_assertions::assert_eq;
 
 use sqlparser::{
-    ast::{BinaryOperator, Expr, Ident, QuoteDelimitedString, Value, ValueWithSpan}, dialect::OracleDialect, parser::ParserError, tokenizer::Span
+    ast::{BinaryOperator, Expr, Ident, QuoteDelimitedString, Value, ValueWithSpan},
+    dialect::OracleDialect,
+    parser::ParserError,
+    tokenizer::Span,
 };
 use test_utils::{expr_from_projection, number, TestedDialects};
 
@@ -188,19 +191,28 @@ fn parse_invalid_quote_delimited_strings() {
     for q in [' ', '\t', '\r', '\n'] {
         assert_eq!(
             oracle().parse_sql_statements(&format!("SELECT Q'{q}abc{q}' FROM dual")),
-            Err(ParserError::TokenizerError("Invalid space, tab, newline, or EOF after 'Q'' at Line: 1, Column: 10".into())),
-            "with quote char {q:?}");
+            Err(ParserError::TokenizerError(
+                "Invalid space, tab, newline, or EOF after 'Q'' at Line: 1, Column: 10".into()
+            )),
+            "with quote char {q:?}"
+        );
     }
     // ~ invalid eof after quote
     assert_eq!(
         oracle().parse_sql_statements("SELECT Q'"),
-        Err(ParserError::TokenizerError("Invalid space, tab, newline, or EOF after 'Q'' at Line: 1, Column: 10".into())),
-        "with EOF quote char");
+        Err(ParserError::TokenizerError(
+            "Invalid space, tab, newline, or EOF after 'Q'' at Line: 1, Column: 10".into()
+        )),
+        "with EOF quote char"
+    );
     // ~ unterminated string
     assert_eq!(
         oracle().parse_sql_statements("SELECT Q'|asdfa...."),
-        Err(ParserError::TokenizerError("Unterminated string literal at Line: 1, Column: 9".into())),
-        "with EOF quote char");
+        Err(ParserError::TokenizerError(
+            "Unterminated string literal at Line: 1, Column: 9".into()
+        )),
+        "with EOF quote char"
+    );
 }
 
 #[test]