presto-main/src/main/java/io/prestosql/operator/LookupJoinPageBuilder.java/LookupJoinPageBuilder/LookupJoinPageBuilder
class LookupJoinPageBuilder:    public LookupJoinPageBuilder(List<Type> buildTypes)
    {
        this.buildPageBuilder = new PageBuilder(requireNonNull(buildTypes, "buildTypes is null"));
        this.buildOutputChannelCount = buildTypes.size();
    }