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Reinclude performance optimization of Return in Subquery (#8844) 

* Removed template parameter from ReturnExecutor and enforce it to be passthrough

* Revert "Removed template parameter from ReturnExecutor and enforce it to be passthrough"
This was unfortunately going into the wrong direction.

This reverts commit 6a488ee1d97f519c7382ebf783e4217cdb403458.

* Create a new block with exactly 1 Register for a ReturnBlock that is supposed to be used as Subquery result

* Fixed register assertoin for return block optimization

* nished comment where i stop in the midlle of a sent
This commit is contained in:
Michael Hackstein 2019-04-25 09:37:57 +02:00 committed by GitHub
parent e6b73726fd
commit efe451e8fc
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2 changed files with 25 additions and 17 deletions
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36
arangod/Aql/ExecutionNode.cpp
View File

@ -617,9 +617,7 @@ ExecutionNode const* ExecutionNode::getLoop() const {
auto type = node->getType();
if (type == ENUMERATE_COLLECTION || type == INDEX || type == TRAVERSAL ||
type == ENUMERATE_LIST || type == SHORTEST_PATH
|| type == ENUMERATE_IRESEARCH_VIEW
) {
type == ENUMERATE_LIST || type == SHORTEST_PATH || type == ENUMERATE_IRESEARCH_VIEW) {
return node;
}
}
@ -1762,17 +1760,16 @@ bool SubqueryNode::mayAccessCollections() {
// if the subquery contains any of these nodes, it may access data from
// a collection
std::vector<ExecutionNode::NodeType> const types = {
ExecutionNode::ENUMERATE_IRESEARCH_VIEW,
ExecutionNode::ENUMERATE_COLLECTION,
ExecutionNode::INDEX,
ExecutionNode::INSERT,
ExecutionNode::UPDATE,
ExecutionNode::REPLACE,
ExecutionNode::REMOVE,
ExecutionNode::UPSERT,
ExecutionNode::TRAVERSAL,
ExecutionNode::SHORTEST_PATH};
std::vector<ExecutionNode::NodeType> const types = {ExecutionNode::ENUMERATE_IRESEARCH_VIEW,
ExecutionNode::ENUMERATE_COLLECTION,
ExecutionNode::INDEX,
ExecutionNode::INSERT,
ExecutionNode::UPDATE,
ExecutionNode::REPLACE,
ExecutionNode::REMOVE,
ExecutionNode::UPSERT,
ExecutionNode::TRAVERSAL,
ExecutionNode::SHORTEST_PATH};
SmallVector<ExecutionNode*>::allocator_type::arena_type a;
SmallVector<ExecutionNode*> nodes{a};
@ -2037,10 +2034,17 @@ std::unique_ptr<ExecutionBlock> ReturnNode::createBlock(
bool const returnInheritedResults = isRoot && !isDBServer;
// This is an important performance improvement:
// If we have inherited results, we do move the block through
// and do not modify it in any way.
// In the other case it is important to shrink the matrix to exactly
// one register that is stored within the DOCVEC.
RegisterId const numberOutputRegisters =
returnInheritedResults ? getRegisterPlan()->nrRegs[getDepth()] : 1;
ReturnExecutorInfos infos(inputRegister,
getRegisterPlan()->nrRegs[previousNode->getDepth()],
getRegisterPlan()->nrRegs[getDepth()], _count,
returnInheritedResults);
numberOutputRegisters, _count, returnInheritedResults);
if (returnInheritedResults) {
return std::make_unique<ExecutionBlockImpl<ReturnExecutor<true>>>(&engine, this,
std::move(infos));

6
arangod/Aql/ExecutorInfos.cpp
View File

@ -50,7 +50,11 @@ ExecutorInfos::ExecutorInfos(
if (_outRegs == nullptr) {
_outRegs = std::make_shared<decltype(_outRegs)::element_type>();
}
TRI_ASSERT(nrInputRegisters <= nrOutputRegisters);
// The second assert part is from ReturnExecutor special case, we shrink all
// results into a single Register column.
TRI_ASSERT((nrInputRegisters <= nrOutputRegisters) ||
(nrOutputRegisters == 1 && _registersToKeep->empty() &&
_registersToClear->empty()));
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
for (RegisterId const inReg : *_inRegs) {