8000 Fix numeric overflow in WINDOW cost estimtation by jsteemann · Pull Request #14464 · arangodb/arangodb · GitHub
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Fix numeric overflow in WINDOW cost estimtation #14464

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Jul 6, 2021
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Fix numeric overflow in WINDOW cost estimtation #14464

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Fix numeric overflow in WINDOW cost estimtation 
* Fix numeric overflow in AQL WINDOW node cost estimation if the number of
  preceding rows was set to `unbounded`.
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@jsteemann
jsteemann committed Jul 5, 2021
commit a52cf8ba97b5912a66c54a303751399678a5f092
3 changes: 3 additions & 0 deletions CHANGELOG
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@@ -1,6 +1,9 @@
devel
-----

* Fix numeric overflow in AQL WINDOW node cost estimation if the number of
preceding rows was set to `unbounded`.

* Updated ArangoDB Starter to 0.15.1-preview-3.

* Added garbage collection for finished and failed Pregel conductors.
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10 changes: 8 additions & 2 deletions arangod/Aql/WindowNode.cpp
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Expand Up @@ -492,8 +492,14 @@ CostEstimate WindowNode::estimateCost() const {
// we never return more rows than above
CostEstimate estimate = _dependencies.at(0)->getCost();
if (_rangeVariable == nullptr) {
int64_t numRows = 1 + _bounds.numPrecedingRows() + _bounds.numFollowingRows();
estimate.estimatedCost += double(numRows * numRows) * _aggregateVariables.size();
uint64_t numRows = 1;
if ( _bounds.unboundedPreceding()) {
numRows += estimate.estimatedNrItems;
} else {
numRows += std::min<uint64_t>(estimate.estimatedNrItems, _bounds.numPrecedingRows());
}
numRows += _bounds.numFollowingRows();
estimate.estimatedCost += double(numRows) * double(numRows) * _aggregateVariables.size();
} else { // guestimate
estimate.estimatedCost += 4 * _aggregateVariables.size();
}
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