Support Snowflake - allow number as placeholder (e.g. :1) (#1001)

tests/sqlparser_snowflake.rs

@@ -1079,6 +1079,20 @@ fn test_snowflake_trim() {
     );
 }
 
+#[test]
+fn test_number_placeholder() {
+    let sql_only_select = "SELECT :1";
+    let select = snowflake().verified_only_select(sql_only_select);
+    assert_eq!(
+        &Expr::Value(Value::Placeholder(":1".into())),
+        expr_from_projection(only(&select.projection))
+    );
+
+    snowflake()
+        .parse_sql_statements("alter role 1 with name = 'foo'")
+        .expect_err("should have failed");
+}
+
 #[test]
 fn parse_position_not_function_columns() {
     snowflake_and_generic()