Spatial functions such as ST_Within and ST_Boundary return a Boolean. Instead, I would like to be able to return the feature id's of the features used in these functions. Example, instead of ST_Within(A,B) being true or false, I'd like to get the feature ids of A that are within B. So if A contains points, B contains polygons, which point features of A are within B. How do I do this?
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