On Tue, Nov 2, 2010 at 12:47 PM, Tim Robertson
<timrobertson...@gmail.com> wrote:
> Hi all,
>
> Is the following a valid UDF please?
>
> When I run it I get the following so I presume not:
> hive> select toGoogleCoords(latitude,longitude,1) from
> raw_occurrence_record limit 100;
> FAILED: Error in semantic analysis:
> java.lang.IllegalArgumentException: Error: name expected at the
> position 7 of 'struct<>' but '>' is found.
>
> Is it possible to return an Array from a UDF?
>
> Thanks for any pointers,
> Tim
>
>
>
>
> public class GoogleTileCoordsUDF extends UDF {
>
> public IntWritable[] evaluate(Text latitude, Text longitude,
> IntWritable zoomLevel) {
> if (latitude == null
> || longitude == null
> || zoomLevel == null) {
> return null;
> }
>
> double lat = Double.parseDouble(latitude.toString());
> double lng = Double.parseDouble(longitude.toString());
>
> Point p = GoogleTileUtil.toTileXY(lat, lng, zoomLevel.get());
>
> if (p==null) {
> return null;
> }
>
> IntWritable[] xy = new IntWritable[2];
> xy[0]=new IntWritable(p.x);
> xy[1]=new IntWritable(p.y);
> return xy;
> }
> }
>
I believe a UDF can not return an Array type. You may have to use the
GenericUDF interface for that.
