count operation of fill function has null values

[vilmount]

The default value for the count operation is null, not 0.

cs:fill{ layer = "teste", operation = "count", attribute = "rodcount" }

[pedro-andrade-inpe]

Strange. The test for windows looks fine: https://github.com/TerraME/terrame/blob/master/packages/terralib/log/windows/lines-count.png

@vilmount, can you provide a script and data to reproduce such problem?

[vilmount]

My result

[pedro-andrade-inpe]

The script creates attribute "rodcount", while the image has attribute "apcount". Anyway, I need script and data in order to reproduce such problem.

[avancinirodrigo]

It seems associated to default argument.

[avancinirodrigo]

There is no default for count.

[pedro-andrade-inpe]

You are right:

            count = function()
                if belong(repr, {"point", "line", "polygon", "surface"}) then
                    verifyUnnecessaryArguments(data, {"attribute", "layer", "operation"})
                    data.select = "FID"
                else
                    customError("The operation '"..data.operation.."' is not available for layers with "..repr.." data.") -- SKIP
                end
            end,

Just set the default value of default to zero and check the images in the log directory. The only strange point is why it is shown as zero in the logs.

This issue might be related to #1784 (although the other one is a PostGIS problem).

[avancinirodrigo]

@pedro-andrade-inpe, I guess that there is another problema here beyond the default. The count operation creates a data with null values, but Map is coloring as 0. test/shapefile/Layer.lua

        clamaz:fill{
            operation = "count",
            layer = portos,
            attribute = "pointcount"
        }

        cs = CellularSpace{
            project = proj,
            layer = clamaz.name
        }

        map = Map{
            target = cs,
            select = "pointcount",
            value = {0, 1, 2},
            color = {"green", "red", "blue"}
        }

[pedro-andrade-inpe]

When a cellularspace is loaded, how null values are read?

[avancinirodrigo]

@pedro-andrade-inpe Currently, terralib returns the value as 0, but it is possible to check if the value is null, however, if a value is set as nil in a table, the key is removed.
What would be the solution for it?

[pedro-andrade-inpe]

Solved by https://github.com/TerraME/terrame/pull/1835/commits/073a8762788e6a2eabb261253f7c0b381120f06a.