Github user navsan commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/41#discussion_r68634878
--- Diff: relational_operators/HashJoinOperator.cpp ---
@@ -65,21 +65,11 @@ DEFINE_bool(vector_based_joined_tuple_collector, false,
"If true, use simple vector-based joined tuple collector in "
"hash join, with a final sort pass to group joined tuple pairs
"
"by inner block. If false, use unordered_map based collector
that "
- "keeps joined pairs grouped by inner block as they are found "
- "(this latter option has exhibited performance/scaling
problems, "
- "particularly in NUMA contexts).");
+ "keeps joined pairs grouped by inner block as they are
found.");
--- End diff --
Sure, I can change that.
Do we actually need the vector_based collector at all? If itâs unclear
whether it will ever outperform map_based, maybe we should just get rid of it?
> On Jun 27, 2016, at 13:53, Harshad Deshmukh <[email protected]>
wrote:
>
> In relational_operators/HashJoinOperator.cpp
<https://github.com/apache/incubator-quickstep/pull/41#discussion_r68634602>:
>
> > @@ -65,21 +65,11 @@ DEFINE_bool(vector_based_joined_tuple_collector,
false,
> > "If true, use simple vector-based joined tuple collector
in "
> > "hash join, with a final sort pass to group joined tuple
pairs "
> > "by inner block. If false, use unordered_map based
collector that "
> > - "keeps joined pairs grouped by inner block as they are
found "
> > - "(this latter option has exhibited performance/scaling
problems, "
> > - "particularly in NUMA contexts).");
> > + "keeps joined pairs grouped by inner block as they are
found.");
> Hi @navsan <https://github.com/navsan>
> How about changing the flag name to map_based_joined_tuple_collector and
switch the default to true?
>
> â
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