Query performance improvements

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The query caching mechanism works well for queries. However if users issue
a lot pattern queries e.g. expression1 and expression2 where each of the
expressions are complex queries in their own right.

It will be nice if the query cache were to cache selected subqueries. This
way if users reuse expression2 from the above example in a dozen other
queries they will benefit from the query cache.

Original issue reported on code.google.com by amitshar...@gmail.com on 15 Jun 2009 at 5:31

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Original comment by dp.max...@gmail.com on 17 Jun 2009 at 10:48