GDALVector: improve NULL handling for attribute and geometry fields in feature write methods

USDAForestService / gdalraster

R Bindings to GDAL (Geospatial Data Abstraction Library)

https://usdaforestservice.github.io/gdalraster/

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GDALVector: improve NULL handling for attribute and geometry fields in feature write methods #524

Closed ctoney closed 3 weeks ago

ctoney commented 3 weeks ago

On the R side, NA, NULL and empty vector like raw(0) map to OGR NULL (i.e., SetFieldNull() for attribute fields, or SetGeomField() to NULL geometry). This PR mainly improves input checking for NA/NULL and adds several tests.