Hi, Patrik, Would it be possible for to issue two queries with the same where clause, but different select clauses?
John On 12/7/12 4:13 AM, Patrik Nisen wrote: > Hi, > > and thank you for your great work! > > I am currently looking into performing operations for pre-filtered > sets of rows, and I would need some help to understand if this is > possible at the moment to do with fastbit, or advice to implement it. > > I have a dataset saved into a single data partition and my goal is to > perform filtering with varying conditions, save these results and use > them as starting sets for later queries. If I have understood > correctly, this is at the moment possible by retrieving the RIDSet from > an evaluated query, saving that, and setting it (query::setRIDs) to the > next query. However, I would like to use aggregate functions with the > following queries, but I did not find a way to do similar things with > the table interface. > > So my question is: how could I perform the described aggregation for a > pre-filtered set of rows? In addition, as I'm only having one partition, > I would prefer to save the filtering results as bitvectors > (query::getHitVector) and reuse them later as masks due to their smaller > size. There's a protected function query::doEvaluate having this > functionality, and perhaps that could be opened. Would this make any > sense? > > Thanks for your help! > > > Patrik Nisen > _______________________________________________ > FastBit-users mailing list > [email protected] > https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users > _______________________________________________ FastBit-users mailing list [email protected] https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users
