code: protected void addDefaults() {
      try {
        Parser.CNode.addIdentifier("inner", InnerJoinRecordReader.class);
        Parser.CNode.addIdentifier("outer", OuterJoinRecordReader.class);
        Parser.CNode.addIdentifier("override", OverrideRecordReader.class);
        Parser.WNode.addIdentifier("tbl", WrappedRecordReader.class);
      } catch (NoSuchMethodException e) {
        throw new RuntimeException("FATAL: Failed to init defaults", e);
      }
    }
docs: Adds the default set of identifiers to the parser.