I have a feature type of polygons, namely A, and want to use it as the candidate in a SpatialFilter against another feature type of polygons as the filter, namely B. B consists of a few groups of polygons, each group has an unique group name. What I want to achieve is like looping through each group of polygons in B as one filter against the same candidate of polygons of A. I see the SpatialFilter has a "group by" parameter but it requires both the candidate and filter having the same group names, which is not the case here for the candidate. Seems a simple and reasonable scenario, but I can't figure out a way to do this. Any advice or hints are welcome.
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