[pull] master from OSGeo:master #117
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- Automate loading duckdb_spatial extension when installed, and when the dataset is DuckDB or Parquet - Retrieve geometries (GEOMETRY type) as OGR geometries - Read GeoParquet metadata to figure out spatial extent, CRS and geometry type per geometry column - Use duckdb_spatial ST_Intersects() for faster spatial filtering (when done with OGRLayer::SetSpatialFilter()), potentially leveraging DuckDB RTree when it is available. - Use GeoParquet bounding box column in complement to above - Passthrough forward of WHERE claused expresse through OGRLayer::SetAttributeFilter()
ADBC: add spatial support for DuckDB databases and GeoParquet
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