cql2 docs: - https://github.com/radiantearth/stac-api-spec/pull/225 - https://github.com/opengeospatial/ogcapi-features/issues/601#issuecomment-940066783 - https://github.com/radiantearth/stac-api-spec/blob/f5da775080ff3ff46d454c2888b6e796ee956faf/fragments/filter/README.md
