presto-main/src/main/java/io/prestosql/operator/project/DictionaryAwarePageFilter.java/DictionaryAwarePageFilter/DictionaryAwarePageFilter
class DictionaryAwarePageFilter:    public DictionaryAwarePageFilter(PageFilter filter)
    {
        this.filter = requireNonNull(filter, "filter is null");

        verify(filter.isDeterministic(), "filter must be deterministic");
        verify(filter.getInputChannels().size() == 1, "filter must have only one input");
    }