Github user zuyu commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/257#discussion_r122482057
--- Diff: query_optimizer/PhysicalGenerator.cpp ---
@@ -176,6 +177,8 @@ P::PhysicalPtr PhysicalGenerator::optimizePlan() {
rules.emplace_back(new AttachLIPFilters());
}
+ rules.push_back(std::make_unique<Partition>(optimizer_context_));
--- End diff --
I have revisited the partition rule, and think it is ok for now to put it
between two LIP-related rules, as for `HashJoin` we only have the following
changes to a physical plan
1. add additional `Selections` for base tables or subquery relations, and
a few non-LIP related operators like `sort` and `union all`.
1. change output `PartitionSchemeHeader` of a Physical Plan node.
But for partitioned aggregation in a follow-up PR, we may add another
aggregate operator as a finalize step. On the other hand, the original
aggregation maybe substituted by a newly created aggregation with the same
input node, so I put the partition rule before `AttachLIPFilters`.
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