public static Value oci_set_prefetch(Env env, @NotNull OracleStatement stmt, @Optional("1") int rows)
public static boolean oci_set_prefetch(Env env, @NotNull OracleStatement stmt, @Optional("1") int rows)
  public static Value oci_set_prefetch(Env env,                                       @NotNull OracleStatement stmt,                                       @Optional("1") int rows)  {    throw new UnimplementedException("oci_set_prefetch");  }