I got there in the end by specifying my Row record like this ... but there
must be a neater way of doing this ??
val trainRDD = rawTrainData.map( rawRow => rawRow.split(","))
.map( p => Row(
p(0),p(1),p(2),p(3),p(4),p(5),p(6),p(7),p(8),p(9),
p(10),p(11),p(12),p(13),p(14),p(15),p(16),p(17),p(18),p(19),
.................
p(770),p(771),p(772),p(773),p(774),p(775),p(776),p(777),p(778),p(779),
p(780),p(781),p(782),p(783),p(784)
i.e by specifying all 785 elements physically
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