public static FunctionToSqlConverter functionToSqlConverter() {
    return FUNCTION_TO_SQL_CONVERTER;
  }
@Test
  public void shouldGetSqlTypeForAllParamTypes() {
    for (Entry<ParamType, SqlType> entry : SQL_TO_FUNCTION.inverse().entrySet()) {
      ParamType param = entry.getKey();
      if (REQUIRES_SCHEMA_SPEC.contains(param)) {
        continue;
      }

      SqlType sqlType = entry.getValue();
      assertThat(SchemaConverters.functionToSqlConverter().toSqlType(param), is(sqlType));
    }
  }