public CrossTab( Pipe previous, Fields argumentFieldSelector, CrossTabOperation crossTabOperation, Fields fieldDeclaration )
{
super( previous );
// assert size of input
Pipe pipe = new Each( previous, argumentFieldSelector, new Identity( new Fields( "n", "l", "v" ) ) );
// name and rate against others of same movie
pipe = new CoGroup( pipe, new Fields( "l" ), 1, new Fields( "n1", "l", "v1", "n2", "l2", "v2" ) );
// remove useless fields
pipe = new Each( pipe, new Fields( "l", "n1", "v1", "n2", "v2" ), new Identity() );
// remove lines if the names are the same
pipe = new Each( pipe, new RegexFilter( "^[^\\t]*\\t([^\\t]*)\\t[^\\t]*\\t\\1\\t.*", true ) );
// transpose values in fields by natural sort order
pipe = new Each( pipe, new SortElements( new Fields( "n1", "v1" ), new Fields( "n2", "v2" ) ) );
// unique the pipe
pipe = new GroupBy( pipe, Fields.ALL );
pipe = new Every( pipe, Fields.ALL, new First(), Fields.RESULTS );
// out: name1, name2, movie, name1, rate1, name2, rate2
pipe = new GroupBy( pipe, new Fields( "n1", "n2" ) );
// out: movie, name1, rate1, name2, rate2, score
pipe = new Every( pipe, new Fields( "v1", "v2" ), crossTabOperation );
pipe = new Each( pipe, new Identity( fieldDeclaration ) );
setTails( pipe );
}