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RE: Proxycache Documentation - again , . . . .
> An important design consideration was to reduce the cost of query
> containment. Proxy cache is designed to improve performance for a subset
> of queries which belong to specified templates. Thus containment is
> checked between queries of the same template. Apart from reducing the
> number of filter and attribute set comparisons, it greatly simplifies
> filter containment (at least for conjunctive queries). This does result
> in slightly reduced cache answerability.
I clearly see your point, but Reinhard's consideration
is really intuitive. I'm working on query templating
for a totally unrelated issue, but I'll try to get
inspiration from your code. I think the possibiity to
recognize sub-contained queries should be investigated.
I'll have a look at it.