Hi Luca, You have to handle the case when rereduce is true (and keys will then be null). See e.g.
http://wiki.apache.org/couchdb/Introduction_to_CouchDB_views#Reduce_Functions Cheers, Mike On Tue, Sep 30, 2014 at 11:05 AM, Luca Morandini <lmorand...@ieee.org> wrote: > Folks, > > I wrote a view to join docs on a common attribute, making the reduce part > store docs with the same key for both sides of the join. > > This works for a few docs, but when I try to run the view on, say 100K > docs, CouchDB's logs keep on saying: > OS Process #Port<0.3458> Log :: function raised exception (new > TypeError("keys is null", "undefined", 5)) > > The view is as such: > > The Map part: > function (doc) { > if (doc.joinside) { > emit([ doc.joinkey, doc.joinside ], doc.feature); > } > } > > The Reduce part: > function (keys, values, rereduce) { > var lefts = []; > var rights = []; > > for (var i = 0; i < keys.length; i++) { > if (keys[i][0][1] == "left") { > lefts.push(values[i]); > } else { > rights.push(values[i]); > } > } > > return { > lefts : lefts, > rights : rights > }; > } > > ...as you may have guessed, I had to set the reduce_limit to false (it is > supposed to run only at group_level=1.. > At the moment, the view runs on an Ubuntu 14.04, CouchDB 1.5.0. > > View's output with a few dozens docs looks fine: > lefts: [ > { > type: "Feature", > properties: { > boundedBy: [ > 147.2908, > -32.1711, > 147.2908, > -32.1711 > ], > timeName: "2011", > geometryID: "1", > numberOfMeters: null, > numberOfReadings: null > }, > id: "CombinedMeterReadings.fid--3d7017ee_14733c15f9f_-2c90" > }, > { > type: "Feature", > properties: { > boundedBy: [ > 147.2908, > -32.1711, > 147.2908, > -32.1711 > ], > timeName: "2011", > geometryID: "1", > numberOfMeters: null, > numberOfReadings: null > }, > id: "CombinedMeterReadings.fid--3d7017ee_14733c15f9f_-2c89" > }, > { > type: "Feature", > properties: { > boundedBy: [ > 147.2908, > -32.1711, > 147.2908, > -32.1711 > ], > timeName: "2011", > geometryID: "1", > numberOfMeters: null, > numberOfReadings: null > }, > id: "CombinedMeterReadings.fid--3d7017ee_14733c15f9f_-2c82" > } > ], > rights: [ > { > type: "Feature", > geometry: null, > properties: { > geographicid: "1", > geographicname: "New South Wales", > property: "Unit", > chronological: "ThreeMonth", > daterange: "2014-01-01 to 2014-03-31", > autscnt: 1284 > } > } > ] > } > > Regards, > > Luca Morandini > Data Architect - AURIN project > Melbourne eResearch Group > Department of Computing and Information Systems > University of Melbourne > Tel. +61 03 903 58 380 > Skype: lmorandini > >
