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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/searchlib/expression/expressiontree.h>
#include <vespa/searchlib/expression/resultnode.h>
namespace search::aggregation {
using search::expression::DocId;
#define DECLARE_ABSTRACT_AGGREGATIONRESULT(cclass) \
DECLARE_IDENTIFIABLE_ABSTRACT_NS2(search, aggregation, cclass); \
private: \
public:
#define DECLARE_AGGREGATIONRESULT_BASE(cclass) \
DECLARE_IDENTIFIABLE_NS2(search, aggregation, cclass); \
DECLARE_NBO_SERIALIZE;
#define DECLARE_AGGREGATIONRESULT(cclass) \
DECLARE_AGGREGATIONRESULT_BASE(cclass); \
cclass *clone() const override { return new cclass(*this); } \
private: \
void onMerge(const AggregationResult & b) override; \
void onAggregate(const ResultNode &result) override; \
void onReset() override; \
public:
// resultNodePrimitive : countHits | hits(INTEGER) | groups(INTEGER) | xor | sum | min | max |avg
class AggregationResult : public expression::ExpressionNode
{
public:
using ResultNode = expression::ResultNode;
DECLARE_NBO_SERIALIZE;
DECLARE_ABSTRACT_AGGREGATIONRESULT(AggregationResult);
AggregationResult(const AggregationResult &);
AggregationResult & operator = (const AggregationResult &);
AggregationResult(AggregationResult &&) = default;
AggregationResult & operator = (AggregationResult &&) = default;
~AggregationResult() override;
class Configure : public vespalib::ObjectOperation, public vespalib::ObjectPredicate
{
private:
void execute(vespalib::Identifiable &obj) override;
bool check(const vespalib::Identifiable &obj) const override;
};
void visitMembers(vespalib::ObjectVisitor & visitor) const override;
void selectMembers(const vespalib::ObjectPredicate & predicate, vespalib::ObjectOperation & operation) override;
void reset() { onReset(); }
void merge(const AggregationResult & b) { onMerge(b); }
virtual void postMerge() {}
void aggregate(const document::Document & doc, HitRank rank);
void aggregate(DocId docId, HitRank rank);
AggregationResult &setExpression(ExpressionNode::UP expr);
AggregationResult &setResult(const ResultNode::CP &result) {
prepare(result.get(), true);
return *this;
}
const ResultNode & getRank() const { return onGetRank(); }
const ResultNode * getResult() const override { return &onGetRank(); }
virtual ResultNode & getResult() { return const_cast<ResultNode &>(onGetRank()); }
virtual AggregationResult * clone() const override = 0;
const ExpressionNode * getExpression() const { return _expressionTree->getRoot(); }
ExpressionNode * getExpression() { return _expressionTree->getRoot(); }
protected:
AggregationResult();
private:
void onPrepare(bool preserveAccurateTypes) override { (void) preserveAccurateTypes; }
bool onExecute() const override { return true; }
void prepare() { if (getExpression() != nullptr) { prepare(getExpression()->getResult(), false); } }
void prepare(const ResultNode * result, bool useForInit) { if (result) { onPrepare(*result, useForInit); } }
virtual void onPrepare(const ResultNode & result, bool useForInit) = 0;
virtual void onMerge(const AggregationResult & b) = 0;
virtual void onReset() = 0;
virtual void onAggregate(const ResultNode &result) = 0;
virtual const ResultNode & onGetRank() const = 0;
virtual void onAggregate(const ResultNode &result, const document::Document & doc, HitRank rank) {
(void) doc;
(void) rank;
onAggregate(result);
}
virtual void onAggregate(const ResultNode &result, DocId docId, HitRank rank) {
(void) docId;
(void) rank;
onAggregate(result);
}
std::shared_ptr<expression::ExpressionTree> _expressionTree;
uint32_t _tag;
};
}
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