Add support for $$ in generic dialect ... (apache#1185)

Author: milenkovicm

src/parser/mod.rs

@@ -5954,7 +5954,8 @@ impl<'a> Parser<'a> {
     pub fn parse_function_definition(&mut self) -> Result<FunctionDefinition, ParserError> {
         let peek_token = self.peek_token();
         match peek_token.token {
-            Token::DollarQuotedString(value) if dialect_of!(self is PostgreSqlDialect) => {
+            Token::DollarQuotedString(value) if dialect_of!(self is PostgreSqlDialect | GenericDialect) =>
+            {
                 self.next_token();
                 Ok(FunctionDefinition::DoubleDollarDef(value.value))
             }

tests/sqlparser_postgres.rs

@@ -3305,7 +3305,7 @@ fn parse_create_function() {
 
     let sql = "CREATE OR REPLACE FUNCTION add(a INTEGER, IN b INTEGER = 1) RETURNS INTEGER LANGUAGE SQL IMMUTABLE RETURN a + b";
     assert_eq!(
-        pg().verified_stmt(sql),
+        pg_and_generic().verified_stmt(sql),
         Statement::CreateFunction {
             or_replace: true,
             temporary: false,