presto-main/src/main/java/io/prestosql/sql/gen/JoinCompiler.java/JoinCompiler/generateGetChannelCountMethod
class JoinCompiler:    private static void generateGetChannelCountMethod(ClassDefinition classDefinition, int outputChannelCount)
    {
        classDefinition.declareMethod(
                a(PUBLIC),
                "getChannelCount",
                type(int.class))
                .getBody()
                .push(outputChannelCount)
                .retInt();
    }