multi-key index

Hi everyone,

From the TODO items:
Use index to restrict rows returned by multi-key index
when used with non-consecutive keys to reduce heap
accesses.
For an index on col1,col2,col3, and a WHERE clause of
col1 = 5 and col3 = 9, spin though the index checking
for col1 and col3 matches, rather than just col1; also
called skip-scanning. 


I was looking in the archives something about this but
i found nothing. Where can i found the thread (i
suppose should be one) about this issue?

regards,
Jaime Casanova

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