Hawkin
/
arangodb
mirror of https://gitee.com/bigwinds/arangodb
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

for equality-only comparisons evaluate dynamic expressions just once and not twice

This commit is contained in:
Jan Steemann 2015-05-01 01:40:07 +02:00
parent 3f9dbb4220
commit 28e062ca91
2 changed files with 107 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

167
arangod/Aql/ExecutionBlock.cpp
View File

@ -1115,6 +1115,11 @@ IndexRangeBlock::~IndexRangeBlock () {
delete _edgeIndexIterator;
}
bool IndexRangeBlock::useHighBounds () const {
auto en = static_cast<IndexRangeNode const*>(getPlanNode());
return (en->_index->type == TRI_IDX_TYPE_SKIPLIST_INDEX);
}
bool IndexRangeBlock::hasV8Expression () const {
for (auto expression : _allVariableBoundExpressions) {
TRI_ASSERT(expression != nullptr);
@ -1127,7 +1132,7 @@ bool IndexRangeBlock::hasV8Expression () const {
}
void IndexRangeBlock::buildExpressions () {
auto en = static_cast<IndexRangeNode const*>(getPlanNode());
bool const useHighBounds = this->useHighBounds();
size_t posInExpressions = 0;
@ -1135,6 +1140,7 @@ void IndexRangeBlock::buildExpressions () {
// the current incoming item:
AqlItemBlock* cur = _buffer.front();
auto en = static_cast<IndexRangeNode const*>(getPlanNode());
std::unique_ptr<IndexOrCondition> newCondition;
for (size_t i = 0; i < en->_ranges.size(); i++) {
@ -1177,15 +1183,32 @@ void IndexRangeBlock::buildExpressions () {
}
if (! bound.isArray()) {
auto b(bound.copy());
RangeInfo ri(r._var,
r._attr,
RangeInfoBound(l.inclusive(), true, b), // will steal b's JSON
RangeInfoBound(),
false);
if (useHighBounds) {
auto b(bound.copy());
for (size_t j = 0; j < collector[k].size(); j++) {
collector[k][j].fuse(ri);
RangeInfo ri(r._var,
r._attr,
RangeInfoBound(l.inclusive(), true, b), // will steal b's JSON
RangeInfoBound(),
false);
for (size_t j = 0; j < collector[k].size(); j++) {
collector[k][j].fuse(ri);
}
}
else {
auto b1(bound.copy()); // first instance of bound
auto b2(bound.copy()); // second instance of same bound
RangeInfo ri(r._var,
r._attr,
RangeInfoBound(l.inclusive(), true, b1), // will steal b1's JSON
RangeInfoBound(l.inclusive(), true, b2), // will steal b2's JSON
false);
for (size_t j = 0; j < collector[k].size(); j++) {
collector[k][j].fuse(ri);
}
}
}
else {
@ -1207,57 +1230,58 @@ void IndexRangeBlock::buildExpressions () {
}
}
for (auto const& h : r._highs) {
Expression* e = _allVariableBoundExpressions[posInExpressions];
TRI_ASSERT(e != nullptr);
TRI_document_collection_t const* myCollection = nullptr;
AqlValue a = e->execute(_trx, cur, _pos, _inVars[posInExpressions], _inRegs[posInExpressions], &myCollection);
posInExpressions++;
if (useHighBounds) {
for (auto const& h : r._highs) {
Expression* e = _allVariableBoundExpressions[posInExpressions];
TRI_ASSERT(e != nullptr);
TRI_document_collection_t const* myCollection = nullptr;
AqlValue a = e->execute(_trx, cur, _pos, _inVars[posInExpressions], _inRegs[posInExpressions], &myCollection);
posInExpressions++;
Json bound;
if (a._type == AqlValue::JSON) {
bound = *(a._json);
a.destroy(); // the TRI_json_t* of a._json has been stolen
}
else if (a._type == AqlValue::SHAPED || a._type == AqlValue::DOCVEC) {
bound = a.toJson(_trx, myCollection);
a.destroy(); // the TRI_json_t* of a._json has been stolen
}
else {
THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_INTERNAL,
"AQL: computed a variable bound and got non-JSON");
}
if (! bound.isArray()) {
auto b(bound.copy());
RangeInfo ri(r._var,
r._attr,
RangeInfoBound(),
RangeInfoBound(h.inclusive(), true, b), // will steal b's JSON
false);
for (size_t j = 0; j < collector[k].size(); j++) {
collector[k][j].fuse(ri);
}
}
else {
std::vector<RangeInfo> riv;
riv.reserve(bound.size());
for (size_t j = 0; j < bound.size(); j++) {
auto b1(bound.at(static_cast<int>(j)).copy()); // first instance of bound
auto b2(bound.at(static_cast<int>(j)).copy()); // second instance of same bound
riv.emplace_back(RangeInfo(r._var,
r._attr,
RangeInfoBound(h.inclusive(), true, b1), // will steal b1's JSON
RangeInfoBound(h.inclusive(), true, b2), // will steal b2's JSON
true));
Json bound;
if (a._type == AqlValue::JSON) {
bound = *(a._json);
a.destroy(); // the TRI_json_t* of a._json has been stolen
}
else if (a._type == AqlValue::SHAPED || a._type == AqlValue::DOCVEC) {
bound = a.toJson(_trx, myCollection);
a.destroy(); // the TRI_json_t* of a._json has been stolen
}
else {
THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_INTERNAL,
"AQL: computed a variable bound and got non-JSON");
}
if (! bound.isArray()) {
auto b(bound.copy());
RangeInfo ri(r._var,
r._attr,
RangeInfoBound(),
RangeInfoBound(h.inclusive(), true, b), // will steal b's JSON
false);
collector[k] = std::move(andCombineRangeInfoVecs(collector[k], riv));
}
for (size_t j = 0; j < collector[k].size(); j++) {
collector[k][j].fuse(ri);
}
}
else {
std::vector<RangeInfo> riv;
riv.reserve(bound.size());
for (size_t j = 0; j < bound.size(); j++) {
auto b1(bound.at(static_cast<int>(j)).copy()); // first instance of bound
auto b2(bound.at(static_cast<int>(j)).copy()); // second instance of same bound
riv.emplace_back(RangeInfo(r._var,
r._attr,
RangeInfoBound(h.inclusive(), true, b1), // will steal b1's JSON
RangeInfoBound(h.inclusive(), true, b2), // will steal b2's JSON
true));
}
collector[k] = std::move(andCombineRangeInfoVecs(collector[k], riv));
}
}
}
}
@ -1295,7 +1319,7 @@ void IndexRangeBlock::buildExpressions () {
if (newCondition != nullptr) {
_condition = newCondition.release();
_freeCondition = true;
// remove duplicates . . .
removeOverlapsIndexOr(*_condition);
}
@ -1320,23 +1344,27 @@ int IndexRangeBlock::initialize () {
// instanciate expressions:
auto instanciateExpression = [&] (RangeInfoBound const& b) -> void {
AstNode const* a = b.getExpressionAst(_engine->getQuery()->ast());
// all new AstNodes are registered with the Ast in the Query
std::unique_ptr<Expression> e(new Expression(_engine->getQuery()->ast(), a));
Expression* expression = nullptr;
{
// all new AstNodes are registered with the Ast in the Query
std::unique_ptr<Expression> e(new Expression(_engine->getQuery()->ast(), a));
TRI_IF_FAILURE("IndexRangeBlock::initialize") {
THROW_ARANGO_EXCEPTION(TRI_ERROR_DEBUG);
TRI_IF_FAILURE("IndexRangeBlock::initialize") {
THROW_ARANGO_EXCEPTION(TRI_ERROR_DEBUG);
}
_allVariableBoundExpressions.emplace_back(e.get());
expression = e.release();
}
_allVariableBoundExpressions.emplace_back(e.get());
auto expression = e.release();
// Prepare _inVars and _inRegs:
_inVars.emplace_back();
std::vector<Variable*>& inVarsCur = _inVars.back();
_inRegs.emplace_back();
std::vector<RegisterId>& inRegsCur = _inRegs.back();
std::unordered_set<Variable*> inVars = expression->variables();
std::unordered_set<Variable*>&& inVars = expression->variables();
for (auto v : inVars) {
inVarsCur.emplace_back(v);
@ -1358,8 +1386,11 @@ int IndexRangeBlock::initialize () {
for (auto const& l : r._lows) {
instanciateExpression(l);
}
for (auto const& h : r._highs) {
instanciateExpression(h);
if (useHighBounds()) {
for (auto const& h : r._highs) {
instanciateExpression(h);
}
}
}
TRI_IF_FAILURE("IndexRangeBlock::initializeExpressions") {
@ -2158,7 +2189,7 @@ bool IndexRangeBlock::setupHashIndexSearchValue (IndexAndCondition const& range)
TRI_ASSERT(pid != 0);
char const* name = TRI_AttributeNameShapePid(shaper, pid);
std::string const lookFor = std::string(name);
std::string const lookFor(name);
for (auto x : range) {
if (x._attr == lookFor) { //found attribute

8
arangod/Aql/ExecutionBlock.h
View File

@ -612,6 +612,14 @@ namespace triagens {
private:
////////////////////////////////////////////////////////////////////////////////
/// @brief whether or not the high bound values should be taken into account
/// they can be ignored for indexes that only support equality conditions,
/// i.e. primary index, edge index and hash index
////////////////////////////////////////////////////////////////////////////////
bool useHighBounds () const;
////////////////////////////////////////////////////////////////////////////////
/// @brief whether or not one of the bounds expressions requires V8
////////////////////////////////////////////////////////////////////////////////