@Override
  public String getDisplayString(String[] children) {
    return "RESTRICT_INFORMATION_SCHEMA()";
  }
UDF to determine whether to enforce restriction of information schema.
This is intended for internal usage only. This function is not a deterministic function,
but a runtime constant. The return value is constant within a query but can be different between queries
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFRestrictInformationSchema.java