Zach Amsden has posted comments on this change. Change subject: IMPALA-4864 Speed up single slot predicates with dictionaries ......................................................................
Patch Set 14: I'm getting kind of disheartened by this approach. The biggest obstacle is that we don't know ahead of time what conjuncts will be useful for filtering, as we don't know which columns are fully dictionary encoded. None of the approaches I have tried really make parity with the baseline, and only very expensive conjuncts on sets of small to mid-size distinct values appear to be a win. It is hard to come up with a data set and query that perform much better without artificially making poor queries to begin with. Nothing reasonable I've tried on TPC-Hx30 or TPC-DSx10 have produced great results. -- To view, visit http://gerrit.cloudera.org:8080/6726 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: comment Gerrit-Change-Id: I65981c89e5292086809ec1268f5a273f4c1fe054 Gerrit-PatchSet: 14 Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-Owner: Zach Amsden <[email protected]> Gerrit-Reviewer: Joe McDonnell <[email protected]> Gerrit-Reviewer: Marcel Kornacker <[email protected]> Gerrit-Reviewer: Michael Ho <[email protected]> Gerrit-Reviewer: Tim Armstrong <[email protected]> Gerrit-Reviewer: Zach Amsden <[email protected]> Gerrit-HasComments: No
