private static void populateValidOptions() {
    validOptions.addOption(ON_OOR_VALUE_OPT, true, 
      "Controls how store operation handles Pig values which are out of range for the target column" +
      "in Hive table.  Default is to throw an exception.");
  }
makes a list of all options that HCatStorer understands
hcatalog/hcatalog-pig-adapter/src/main/java/org/apache/hive/hcatalog/pig/HCatStorer.java