Feat(duckdb): support dollars in identifiers closes #7509

Author: georgesittas

sqlglot/dialects/duckdb.py

@@ -116,6 +116,8 @@ class Tokenizer(tokens.Tokenizer):
             "$": TokenType.PARAMETER,
         }
 
+        VAR_SINGLE_TOKENS = {"$"}
+
         COMMANDS = tokens.Tokenizer.COMMANDS - {TokenType.SHOW}
 
     Parser = DuckDBParser

tests/dialects/test_duckdb.py

@@ -180,6 +180,7 @@ def test_duckdb(self):
         self.validate_identity("SELECT GET_BIT(CAST('0110010' AS BIT), 2)")
         self.validate_identity("SELECT 1 WHERE x > $1")
         self.validate_identity("SELECT 1 WHERE x > $name")
+        self.validate_identity("SELECT 1 AS a$b")
         self.validate_identity("""SELECT '{"x": 1}' -> c FROM t""")
 
         self.assertEqual(