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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "cachedselect.h"
#include "attributefieldvaluenode.h"
#include "select_utils.h"
#include "selectcontext.h"
#include "selectpruner.h"
#include <vespa/document/select/parser.h>
#include <vespa/searchlib/attribute/attributevector.h>
#include <vespa/searchlib/attribute/attribute_read_guard.h>
#include <vespa/searchlib/attribute/iattributemanager.h>
#include <cassert>
namespace proton {
using search::AttributeVector;
using search::AttributeGuard;
using document::select::FieldValueNode;
using search::attribute::CollectionType;
using search::attribute::BasicType;
using NodeUP = std::unique_ptr<document::select::Node>;
namespace {
class AttrVisitor : public document::select::CloningVisitor
{
public:
using AttrMap = std::map<vespalib::string, uint32_t>;
AttrMap _amap;
const search::IAttributeManager &_amgr;
CachedSelect::AttributeVectors &_attributes;
uint32_t _svAttrs;
uint32_t _mvAttrs;
uint32_t _complexAttrs;
uint32_t getFieldNodes() const { return _fieldNodes; }
static uint32_t invalidIdx() {
return std::numeric_limits<uint32_t>::max();
}
AttrVisitor(const search::IAttributeManager &amgr, CachedSelect::AttributeVectors &attributes);
~AttrVisitor() override;
/*
* Mutate field value nodes representing single value attributes into
* attribute field valulue nodes.
*/
void visitFieldValueNode(const FieldValueNode &expr) override;
};
AttrVisitor::AttrVisitor(const search::IAttributeManager &amgr, CachedSelect::AttributeVectors &attributes)
: CloningVisitor(),
_amap(),
_amgr(amgr),
_attributes(attributes),
_svAttrs(0u),
_mvAttrs(0u),
_complexAttrs(0u)
{}
AttrVisitor::~AttrVisitor() = default;
bool isSingleValueThatWeHandle(BasicType type) {
return (type != BasicType::PREDICATE) && (type != BasicType::TENSOR) && (type != BasicType::REFERENCE) && (type != BasicType::RAW);
}
void
AttrVisitor::visitFieldValueNode(const FieldValueNode &expr)
{
++_fieldNodes;
// Expression has survived select pruner, thus we know that field is
// valid for document type.
bool complex = false;
vespalib::string name = SelectUtils::extractFieldName(expr, complex);
auto av = _amgr.readable_attribute_vector(name);
if (av) {
if (complex) {
++_complexAttrs;
// Don't try to optimize complex attribute references yet.
_valueNode = expr.clone();
return;
}
auto guard = av->makeReadGuard(false);
const auto* attr = guard->attribute();
if (attr->getCollectionType() == CollectionType::SINGLE) {
if (isSingleValueThatWeHandle(attr->getBasicType())) {
++_svAttrs;
auto it(_amap.find(name));
uint32_t idx(invalidIdx());
if (it == _amap.end()) {
// Allocate new location for guard
idx = _attributes.size();
_amap[name] = idx;
_attributes.push_back(av);
} else {
// Already allocated location for guard
idx = it->second;
}
assert(idx != invalidIdx());
_valueNode = std::make_unique<AttributeFieldValueNode>(expr.getDocType(), name, idx);
} else {
++_complexAttrs;
// Don't try to optimize predicate/tensor/reference attributes yet.
_valueNode = expr.clone();
}
} else {
// Don't try to optimize multivalue attribute vectors yet
++_mvAttrs;
_valueNode = expr.clone();
}
} else {
_valueNode = expr.clone();
}
}
}
CachedSelect::Session::Session(std::unique_ptr<document::select::Node> docSelect,
std::unique_ptr<document::select::Node> preDocOnlySelect,
std::unique_ptr<document::select::Node> preDocSelect)
: _docSelect(std::move(docSelect)),
_preDocOnlySelect(std::move(preDocOnlySelect)),
_preDocSelect(std::move(preDocSelect))
{
}
bool
CachedSelect::Session::contains(const SelectContext &context) const
{
if (_preDocSelect && (_preDocSelect->contains(context) == document::select::Result::False)) {
return false;
}
return (!_preDocOnlySelect) ||
(_preDocOnlySelect && (_preDocOnlySelect->contains(context) == document::select::Result::True));
}
bool
CachedSelect::Session::contains(const document::Document &doc) const
{
return (_preDocOnlySelect) ||
(_docSelect && (_docSelect->contains(doc) == document::select::Result::True));
}
const document::select::Node &
CachedSelect::Session::selectNode() const
{
return (_docSelect ? *_docSelect : *_preDocOnlySelect);
}
void
CachedSelect::setDocumentSelect(SelectPruner &docsPruner)
{
_allFalse = docsPruner.isFalse();
_allTrue = docsPruner.isTrue();
_allInvalid = docsPruner.isInvalid();
_docSelect = std::move(docsPruner.getNode());
_fieldNodes = docsPruner.getFieldNodes();
_attrFieldNodes = docsPruner.getAttrFieldNodes();
}
void
CachedSelect::setPreDocumentSelect(const search::IAttributeManager &attrMgr,
SelectPruner &noDocsPruner)
{
_attributes.clear();
AttrVisitor allAttrVisitor(attrMgr, _attributes);
_docSelect->visit(allAttrVisitor);
assert(_fieldNodes == allAttrVisitor.getFieldNodes());
assert(_attrFieldNodes == (allAttrVisitor._mvAttrs + allAttrVisitor._svAttrs + allAttrVisitor._complexAttrs));
_svAttrFieldNodes = allAttrVisitor._svAttrs;
if (_fieldNodes == _svAttrFieldNodes) {
_preDocOnlySelect = std::move(allAttrVisitor.getNode());
} else if (_svAttrFieldNodes > 0) {
_attributes.clear();
AttrVisitor someAttrVisitor(attrMgr, _attributes);
noDocsPruner.getNode()->visit(someAttrVisitor);
_preDocSelect = std::move(someAttrVisitor.getNode());
}
}
CachedSelect::CachedSelect()
: _attributes(),
_docSelect(),
_fieldNodes(0u),
_attrFieldNodes(0u),
_svAttrFieldNodes(0u),
_allFalse(false),
_allTrue(false),
_allInvalid(false),
_preDocOnlySelect(),
_preDocSelect()
{ }
CachedSelect::~CachedSelect() = default;
void
CachedSelect::set(const vespalib::string &selection,
const document::DocumentTypeRepo &repo)
{
try {
document::select::Parser parser(repo, document::BucketIdFactory());
_docSelect = parser.parse(selection);
} catch (document::select::ParsingFailedException &) {
_docSelect.reset(nullptr);
}
_allFalse = !_docSelect;
_allTrue = false;
_allInvalid = false;
}
void
CachedSelect::set(const vespalib::string &selection,
const vespalib::string &docTypeName,
const document::Document &emptyDoc,
const document::DocumentTypeRepo &repo,
const search::IAttributeManager *amgr,
bool hasFields)
{
set(selection, repo);
NodeUP parsed(std::move(_docSelect));
if (!parsed) {
return;
}
SelectPruner docsPruner(docTypeName,
amgr,
emptyDoc,
repo,
hasFields,
true);
docsPruner.process(*parsed);
setDocumentSelect(docsPruner);
if (amgr == nullptr || _attrFieldNodes == 0u) {
return;
}
SelectPruner noDocsPruner(docTypeName,
amgr,
emptyDoc,
repo,
hasFields,
false);
noDocsPruner.process(*parsed);
setPreDocumentSelect(*amgr, noDocsPruner);
}
std::unique_ptr<CachedSelect::Session>
CachedSelect::createSession() const
{
return std::make_unique<Session>((_docSelect ? _docSelect->clone() : NodeUP()),
(_preDocOnlySelect ? _preDocOnlySelect->clone() : NodeUP()),
(_preDocSelect ? _preDocSelect->clone() : NodeUP()));
}
}
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