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arangodb
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do not push sort beyond limit, collect etc.

This commit is contained in:
Jan Steemann 2014-09-08 10:31:44 +02:00
parent c02f304cc3
commit 478007089a
1 changed files with 25 additions and 12 deletions
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37
arangod/Aql/OptimizerRules.cpp
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@ -70,21 +70,34 @@ int triagens::aql::removeRedundantSorts (Optimizer* opt,
auto other = static_cast<SortNode*>(current)->getSortInformation(plan);
switch (sortInfo.isCoveredBy(other)) {
case SortInformation::unequal:
break;
case SortInformation::otherSupersedes:
toUnlink.insert(current);
break;
case SortInformation::weSupersede:
case SortInformation::allEqual:
// the sort at the start of the pipeline makes the sort at the end
// superfluous, so we'll remove it
toUnlink.insert(n);
break;
case SortInformation::unequal:
break;
case SortInformation::otherSupersedes:
toUnlink.insert(current);
break;
case SortInformation::weSupersede:
case SortInformation::allEqual:
// the sort at the start of the pipeline makes the sort at the end
// superfluous, so we'll remove it
toUnlink.insert(n);
break;
}
}
else if (current->getType() == triagens::aql::ExecutionNode::CALCULATION ||
current->getType() == triagens::aql::ExecutionNode::FILTER ||
current->getType() == triagens::aql::ExecutionNode::ENUMERATE_COLLECTION ||
current->getType() == triagens::aql::ExecutionNode::ENUMERATE_LIST) {
// ok
}
else {
// abort at all other type of nodes. we cannot push a sort beyond them
break;
}
auto deps = current->getDependencies();
if (deps.size() != 1) {
// node either has no or more than one dependency. we don't know what to do and must abort
// note: this will also handle Singleton nodes