[gdal-dev] Fields of type List to simple fields with N times the feature?

[Abel Pau]

Hello,

we have tried to generate some layers from MiraMon to SHP, KML, or GPKG, and we have noticed that they do not support "List" field cases. They give a warning like: "The output driver does not seem to natively support IntegerList type for field "XX".

It could be interesting if a driver could output a feature with "List" type fields as the same feature repeated as many times as the elements in the List, if the user requests it (via -lco). This would be beneficial to avoid losing elements from fields that are of type List.

The current implementation generates an IntegerList, but this modification could be done.

As we want to export the information somehow, even if it's not perfect, we are wondering which of these solutions we can apply:
1. (preferable) export N objects, each with a single attribute, not as an "IntegerList" but as N "Integer/Float, etc" objects.
2. export a single object with a single attribute (which could be chosen with a -lco).

However, we are wondering how we should handle the GetFeatureCount() function in case 1 (from the above).
And we also wonder how to handle the GetNextRawFeature() function. Since this function can indicate that it has returned more than one element (in case 1).

Thanks for taking it in consideration.


Abel Pau Garcia
GIS developer
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