BUG: fix reading files with unsupported OGR types (skipped fields)

[jorisvandenbossche]

I was testing locally with https://github.com/OSGeo/gdal/blob/master/autotest/ogr/data/arrow/test.feather, and that includes a bunch of fields with unsupported types, and that actually raises errors because of None being present in the fields (where we expect a integer for the index or a string for the field name)

(just quickly pushing here instead of opening a bug report)

[brendan-ward]

Do we want to raise a warning about unsupported fields?

[jorisvandenbossche]

GDAL already prints a warning for this:

In [3]: pyogrio.read_dataframe("../Downloads/test.feather")
Skipping field time32_s: unsupported OGR type: 10
Skipping field time32_ms: unsupported OGR type: 10
Skipping field list_boolean: unsupported OGR type: 1
Skipping field list_uint8: unsupported OGR type: 1
Skipping field list_int8: unsupported OGR type: 1
Skipping field list_uint16: unsupported OGR type: 1
Skipping field list_int16: unsupported OGR type: 1
Skipping field list_uint32: unsupported OGR type: 13
Skipping field list_int32: unsupported OGR type: 1
Skipping field list_uint64: unsupported OGR type: 3
Skipping field list_int64: unsupported OGR type: 13
Skipping field list_float32: unsupported OGR type: 3
Skipping field list_float64: unsupported OGR type: 3
Skipping field list_string: unsupported OGR type: 5
Skipping field fixed_size_list_boolean: unsupported OGR type: 1
Skipping field fixed_size_list_uint8: unsupported OGR type: 1
Skipping field fixed_size_list_int8: unsupported OGR type: 1
Skipping field fixed_size_list_uint16: unsupported OGR type: 1
Skipping field fixed_size_list_int16: unsupported OGR type: 1
Skipping field fixed_size_list_uint32: unsupported OGR type: 13
Skipping field fixed_size_list_int32: unsupported OGR type: 1
Skipping field fixed_size_list_uint64: unsupported OGR type: 3
Skipping field fixed_size_list_int64: unsupported OGR type: 13
Skipping field fixed_size_list_float32: unsupported OGR type: 3
Skipping field fixed_size_list_float64: unsupported OGR type: 3
Skipping field fixed_size_list_string: unsupported OGR type: 5
Skipping field struct_field.h: unsupported OGR type: 13
Out[3]: 
   boolean  uint8  int8   uint16    int16        uint32  ...                      map_int64         map_float32         map_float64              map_string  dict                 geometry
0      1.0    1.0  -2.0      1.0 -20000.0  1.000000e+00  ...  {"x":-2000000000000,"y":null}  {"x":1.5,"y":null}  {"x":1.5,"y":null}  {"x":"x_val","y":null}   0.0  POINT (0.00000 2.00000)
1      0.0    2.0  -1.0  10001.0 -10000.0  1.000000e+09  ...                        {"z":3}           {"z":3.0}           {"z":3.0}           {"z":"z_val"}   1.0                     None
2      NaN    NaN   NaN      NaN      NaN           NaN  ...                           None                None                None                    None   2.0  POINT (2.00000 2.00000)
3      0.0    4.0   1.0  30001.0  10000.0  3.000000e+09  ...                             {}                  {}                  {}                      {}   NaN  POINT (3.00000 2.00000)
4      1.0    5.0   2.0  40001.0  20000.0  4.000000e+09  ...                             {}                  {}                  {}                      {}   2.0  POINT (4.00000 2.00000)

[5 rows x 45 columns]

[brendan-ward]

Thanks @jorisvandenbossche