ogrinfo: display of (null) -- or not

[peifer]

$ ogrinfo NUTS_3.shp -sql "select distinct ICC from NUTS_3"

...
OGRFeature(NUTS_3):37
  ICC (String) =         # no (null) here

$ ogrinfo NUTS_3.shp -sql "select ICC from NUTS_3 where FID=1399"
...
OGRFeature(NUTS_3):1399
  ICC (String) = (null)  # ..but here

[Even Rouault]

r23421 /trunk/ (4 files in 3 dirs): OGR SQL: with DISTINCT, consider null values are such, and not as empty string (#4353)

[peifer]

Thanks for taking care. I noted that this time, your changes/additions in the code had substantially more lines than my bug report.

[Even Rouault]

r23429 /trunk/autotest/ogr/ (ogr_mem.py ogr_shape.py): SELECT DISTINCT returns null values instead of 0 now. Adjust tests (#4353)