Experimentalfor a geoarrow-* encoding — GeoParquet 1.1 native columns are
nested STRUCT/LIST values with no DuckDB spatial-predicate
expression. Callers must fail closed before constructing SQL rather than
let a malformed ST_Intersects(...) reach DuckDB; use a bbox-covering
column for spatial pushdown and the dedicated native decoder for
geometry projection instead.
SQL expression that yields a DuckDB
GEOMETRYfrom the stored geometry column, adapting to the physical encoding.