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From "Bikramjeet Vig (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-5520: TopN node periodically reclaims old allocations
Date Thu, 13 Jul 2017 23:48:07 GMT
Bikramjeet Vig has posted comments on this change.

Change subject: IMPALA-5520: TopN node periodically reclaims old allocations

Patch Set 3:

File be/src/exec/

PS3, Line 244: tuple_row_comparator_wrapper_
> I think something like ComparatorWrapper(*tuple_row_less_than_) will work.
Please refer to related comment in topn-node.h

PS3, Line 259: NULL
> It would be best to pass in the RuntimeState* - that enables better logging

PS3, Line 271: NULL
> Same here.
File be/src/exec/topn-node.h:

Line 36: #define PUSH_HEAP(v, comp, elem) v.push_back(elem); \
> It's probably best to just make it an inline function, it doesn't seem like

Line 100:   boost::scoped_ptr<ComparatorWrapper<TupleRowComparator>> tuple_row_comparator_wrapper_;
> We don't need to store this additional state, since all the state is in tup
True, but every time POP_HEAP or PUSH_HEAP is used, it will incur the cost of creating a new
wrapper object,which will esp be a problem in InsertTupleRow method

PS3, Line 134: vector
> Also mention that it's updated with push_heap()/pop_heap().

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Gerrit-MessageType: comment
Gerrit-Change-Id: I968f57f0ff2905bd581908bc5c5ee486b31e6aa8
Gerrit-PatchSet: 3
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Bikramjeet Vig <>
Gerrit-Reviewer: Bikramjeet Vig <>
Gerrit-Reviewer: Matthew Jacobs <>
Gerrit-Reviewer: Tim Armstrong <>
Gerrit-HasComments: Yes

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