@Test
public void testAddSourcePrefixDropIndex() throws Exception {

  String ddl = "DROP INDEX `index123` ON table";
  assertEquals(ddl, schemaDatabase.addSourcePrefix(ddl));
  ddl = "DROP INDEX `index222` ON `db_name`.`table22`;";
  String expectedDDL = "DROP INDEX `index222` ON `source/db_name`.`table22`;";
  assertEquals(expectedDDL, schemaDatabase.addSourcePrefix(ddl));
}