Question: When were released the films that have Billy Preston as a cast member?
Choices: 1958-01-01
2006-09-09
2004-04-30
1993-12-22
2012-07-11
2004-09-16
2003-03-21
1980-06-16
1983-01-01
2012-07-02
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "film" . ?e <cast_member> ?e_1 . ?e_1 <pred:name> "Billy Preston" .  ?e <publication_date> ?pv .  }
Program:
function: Find
inputs: Billy Preston
function: Relate
dependencies: 0
inputs: cast member
backward
function: FilterConcept
dependencies: 1
inputs: film
function: QueryAttr
dependencies: 2
inputs: publication date
Answer: 1958-01-01