What is {spouse} of {Mary Astor} that is {start time} is {1928-1-1} ?
Who is the spouse of Mary Astor since 1928-1-1?
SELECT ?obj WHERE { wd:Q232109 p:P26 ?s . ?s ps:P26 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1928')) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q232109> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P26> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1928-1-1>
} 

Who has been married to Mary Astor since January 1, 1928?