Added to pg_index.h file as a comment.
>
> > > > Can someone tell me what we use indislossy for?
>
> Ok, so the interpretation of this field is:
> A match in the index needs to be reevaluated in the heap tuple data,
> since a match in the index does not necessarily mean, that the heap tuple
> matches.
> If the heap tuple data matches, the index must always match.
>
> A very typical example for such an index is a hash index. This might explain the
> fact, that the ODBC driver misinterpreted that field as meaning that the index is a hash.
> The field has nothing to do with partial index.
>
> Andreas
>
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