Cleanup handling for FlatGeobuf driver

CHANGES.md

@@ -1,6 +1,6 @@
 # CHANGELOG
 
-## 0.2.0 (unreleased)
+## 0.2.0
 
 ### Major enhancements
 
@@ -18,6 +18,7 @@
 -   Addition of `pyogrio.__gdal_version__` attribute to return GDAL version tuple
     and `__gdal_version_string__` to return string version.
 -   Addition of `list_drivers` function to list all available GDAL drivers.
+-   Addition of read and write support for `FlatGeobuf` driver when available in GDAL.
 
 ## 0.1.0
 

README.md

@@ -163,6 +163,10 @@ information.
 You can certainly try to read or write using unsupported drivers that are
 available in your installation, but you may encounter errors.
 
+Note: different drivers have different tolerance for mixed geometry types, e.g.,
+MultiPolygon and Polygon in the same dataset. You will get exceptions if you
+attempt to write mixed geometries to a driver that doesn't support them.
+
 ### Listing layers
 
 To list layers available in a data source:

pyogrio/_io.pyx

@@ -787,10 +787,10 @@ def ogr_write(str path, str layer, str driver, geometry, field_data, fields,
     layer_b = layer.encode('UTF-8')
     layer_c = layer_b
 
-    # if shapefile or GeoJSON, always delete first
+    # if shapefile, GeoJSON, or FlatGeobuf, always delete first
     # for other types, check if we can create layers
     # GPKG might be the only multi-layer writeable type.  TODO: check this
-    if driver in ('ESRI Shapefile', 'GeoJSON', 'GeoJSONSeq') and os.path.exists(path):
+    if driver in ('ESRI Shapefile', 'GeoJSON', 'GeoJSONSeq', 'FlatGeobuf') and os.path.exists(path):
         os.unlink(path)
 
     # TODO: invert this: if exists then try to update it, if that doesn't work then always create

pyogrio/raw.py

@@ -7,7 +7,12 @@
     from pyogrio._io import ogr_read, ogr_read_info, ogr_list_layers, ogr_write
 
 
-DRIVERS = {".gpkg": "GPKG", ".shp": "ESRI Shapefile", ".json": "GeoJSON"}
+DRIVERS = {
+    ".gpkg": "GPKG",
+    ".shp": "ESRI Shapefile",
+    ".json": "GeoJSON",
+    ".fgb": "FlatGeobuf",
+}
 
 
 def read(