Polygons passed to poly_overlap have 0 pts when column is indexed using rtree

This “feature” does not affect the original version of poly_overlap as only a bounding box test is preformed.  I
modifiedpoly_overlap in an attempt to improve the preciseness of poly_overlap.  The function works when the column is
notindexed or when the column is indexed using  rtree_gist from the contrib section, but fails when the column is
indexedusing rtree.  Turned out that npts of the polygon retrieved from the table is 0 (the other polygon is a constant
andits 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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