Aklakan commented on issue #3473:
URL: https://github.com/apache/jena/issues/3473#issuecomment-3365671312

   > I will add this as an homework on my end to understand when the spatial 
index is involved in a query,
   
   For the index to be considered, most importantly, at least one side of the 
spatial predicate must be unbound.
   Also, a spatial index must be present (logic falls back to scanning 
otherwise) and some extra conditions on the spatial predicate:
   
   
https://github.com/apache/jena/blob/29e8a5601da695741a342059ab9810794f65f7ca/jena-geosparql/src/main/java/org/apache/jena/geosparql/geo/topological/GenericPropertyFunction.java#L159
   
   > Looks like a misunderstanding from my end. 
   
   It's just a UI design issue that needs to be documented - one can argue 
either way. But as replace is mostly useful for testing / playing around I 
think it should be able to clear the index. An empty index is different from an 
absent index.
   


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