This “feature” does not affect the original version of poly_overlap as only a bounding 
box test is preformed.  I modified poly_overlap in an attempt to improve the 
preciseness of poly_overlap.  The function works when the column is not indexed or 
when the column is indexed using  rtree_gist from the contrib section, but fails when 
the column is indexed using rtree.  Turned out that npts of the polygon retrieved from 
the table is 0 (the other polygon is a constant and its attributes are correct).  I 
suspect the “feature” might affect other functions that uses polygons->npts like 
poly_contain.  Would anyone happens to know the identity of the “offending” function 
might be?

TIA 

Kenneth Chan
-- 
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