[zope2-tracker] [Bug 815469] Re: ZCatalog 2.13.12 doesn't preserve relevance in search results
hanno at hannosch.eu
Sun Jul 24 12:54:16 EDT 2011
Hhm, looks like I wasn't careful enough when trying to understand what
weightedIntersection actually does. I tracked it down to the C code,
where it boils down to:
set_operation(o1, o2, 0, 0, 1, 1, 0, 1, 0);
set_operation(o1, o2, 1, 1, 1, 1, 0, 1, 0);
The fifth and sixth arguments are the weights, thus being equal. We used
that in a call that basically did:
rs = None
r = _apply_index(query)
w, rs = weightedIntersection(rs, r)
and then ignored w.
So I was assuming this had no effect. But looking again, it seems that
weightedIntersection is actually sneaky. It doesn't actually return a
set as everyone else does, but it returns a mapping. The third and forth
argument of the set_operation call are named "use_values". ZCTextIndex
is the only index that returns a mapping and puts that into the
apparently misnamed "resultset" variable.
I'll fix this. I've tried to improve the test coverage of ZCatalog, but
there's still many glaring holes - any help is welcome.
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ZCatalog 2.13.12 doesn't preserve relevance in search results
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