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Teach bitmap path generation about transforming OR-clauses to SAOP's
When optimizer generates bitmap paths, it considers breaking OR-clause arguments one-by-one. But now, a group of similar OR-clauses can be transformed into SAOP during index matching. So, bitmap paths should keep up. This commit teaches bitmap paths generation machinery to group similar OR-clauses into dedicated RestrictInfos. Those RestrictInfos are considered both to match index as a whole (as SAOP), or to match as a set of individual OR-clause argument one-by-one (the old way). Therefore, bitmap path generation will takes advantage of OR-clauses to SAOP's transformation. The old way of handling them is also considered. So, there shouldn't be planning regression. Discussion: https://postgr.es/m/CAPpHfdu5iQOjF93vGbjidsQkhHvY2NSm29duENYH_cbhC6x%2BMg%40mail.gmail.com Author: Alexander Korotkov, Andrey Lepikhov Reviewed-by: Alena Rybakina, Andrei Lepikhov, Jian he, Robert Haas Reviewed-by: Peter Geoghegan
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