Question: What is the earliest year that Jackie Robinson play baseball professionally?
Answer(s):
answer: 1947 Major League Baseball season

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0443c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0443c ns:baseball.baseball_player.batting_stats ?y .
?y ns:baseball.batting_statistics.season ?x .
?x ns:time.event.end_date ?num .
}
ORDER BY ?num LIMIT 1