public OperatorNode<StatementOperator> parse(String programName, String program) throws IOException, RecognitionException {
        yqlplusParser parser = prepareParser(programName, program);
        return convertProgram(parseProgram(parser), parser, programName);
    }
Translate the ANTLR grammar into the logical representation.
container-search/src/main/java/com/yahoo/search/yql/ProgramParser.java