https://rules.gitlabpages.inria.fr/integraal/fr.inria.rules.integraal.util/fr/inria/rules/integraal/util/stream/filter/ConstantFilter.html
ConstantFilter (InteGraal : Knowledge-Representation and Reasoning for Data Integration 3.0.1 API)
declaration: module: fr.inria.rules.integraal.util, package: fr.inria.rules.integraal.util.stream.filter, class: ConstantFilter