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#include "mkql_mapnext.h"
#include <yql/essentials/minikql/computation/mkql_computation_node_holders.h>
namespace NKikimr {
namespace NMiniKQL {
namespace {
struct TState : public TComputationValue<TState> {
using TComputationValue::TComputationValue;
std::optional<NUdf::TUnboxedValue> Prev;
bool Finish = false;
};
class TFlowMapNextWrapper : public TStatefulFlowComputationNode<TFlowMapNextWrapper> {
typedef TStatefulFlowComputationNode<TFlowMapNextWrapper> TBaseComputation;
public:
TFlowMapNextWrapper(TComputationMutables& mutables, EValueRepresentation kind, IComputationNode* flow,
IComputationExternalNode* item, IComputationExternalNode* nextItem, IComputationNode* newItem)
: TBaseComputation(mutables, flow, kind, EValueRepresentation::Any)
, Flow(flow)
, Item(item)
, NextItem(nextItem)
, NewItem(newItem)
{}
NUdf::TUnboxedValue DoCalculate(NUdf::TUnboxedValue& stateValue, TComputationContext& ctx) const {
if (!stateValue.HasValue()) {
stateValue = ctx.HolderFactory.Create<TState>();
}
TState& state = *static_cast<TState*>(stateValue.AsBoxed().Get());
NUdf::TUnboxedValue result;
for (;;) {
if (state.Finish) {
if (!state.Prev) {
return NUdf::TUnboxedValuePod::MakeFinish();
}
Item->SetValue(ctx, std::move(*state.Prev));
state.Prev.reset();
NextItem->SetValue(ctx, NUdf::TUnboxedValuePod());
return NewItem->GetValue(ctx);
}
auto item = Flow->GetValue(ctx);
if (item.IsYield()) {
return item;
}
if (item.IsFinish()) {
state.Finish = true;
continue;
}
if (!state.Prev) {
state.Prev = std::move(item);
continue;
}
Item->SetValue(ctx, std::move(*state.Prev));
state.Prev = item;
NextItem->SetValue(ctx, std::move(item));
result = NewItem->GetValue(ctx);
break;
}
return result;
}
private:
void RegisterDependencies() const final {
if (const auto flow = FlowDependsOn(Flow)) {
Own(flow, Item);
Own(flow, NextItem);
DependsOn(flow, NewItem);
}
}
IComputationNode* const Flow;
IComputationExternalNode* const Item;
IComputationExternalNode* const NextItem;
IComputationNode* const NewItem;
};
class TStreamMapNextWrapper : public TMutableComputationNode<TStreamMapNextWrapper> {
typedef TMutableComputationNode<TStreamMapNextWrapper> TBaseComputation;
public:
TStreamMapNextWrapper(TComputationMutables& mutables, IComputationNode* stream,
IComputationExternalNode* item, IComputationExternalNode* nextItem, IComputationNode* newItem)
: TBaseComputation(mutables)
, Stream(stream)
, Item(item)
, NextItem(nextItem)
, NewItem(newItem)
, StateIndex(mutables.CurValueIndex++)
{}
NUdf::TUnboxedValuePod DoCalculate(TComputationContext& ctx) const {
return ctx.HolderFactory.Create<TStreamValue>(ctx, Stream->GetValue(ctx), Item, NextItem, NewItem, StateIndex);
}
private:
void RegisterDependencies() const final {
DependsOn(Stream);
Own(Item);
Own(NextItem);
DependsOn(NewItem);
}
class TStreamValue : public TComputationValue<TStreamValue> {
public:
using TBase = TComputationValue<TStreamValue>;
TStreamValue(TMemoryUsageInfo* memInfo, TComputationContext& compCtx, NUdf::TUnboxedValue&& stream,
IComputationExternalNode* item, IComputationExternalNode* nextItem, IComputationNode* newItem, ui32 stateIndex)
: TBase(memInfo)
, CompCtx(compCtx)
, Stream(std::move(stream))
, Item(item)
, NextItem(nextItem)
, NewItem(newItem)
, StateIndex(stateIndex)
{
}
private:
ui32 GetTraverseCount() const final {
return 1U;
}
NUdf::TUnboxedValue GetTraverseItem(ui32) const final {
return Stream;
}
NUdf::TUnboxedValue Save() const final {
return NUdf::TUnboxedValuePod::Zero();
}
void Load(const NUdf::TStringRef&) final {}
NUdf::EFetchStatus Fetch(NUdf::TUnboxedValue& result) final {
auto& state = GetState();
for (;;) {
if (state.Finish) {
if (!state.Prev) {
return NUdf::EFetchStatus::Finish;
}
Item->SetValue(CompCtx, std::move(*state.Prev));
state.Prev.reset();
NextItem->SetValue(CompCtx, NUdf::TUnboxedValuePod());
result = NewItem->GetValue(CompCtx);
return NUdf::EFetchStatus::Ok;
}
NUdf::TUnboxedValue item;
const auto status = Stream.Fetch(item);
if (status == NUdf::EFetchStatus::Yield) {
return status;
}
if (status == NUdf::EFetchStatus::Finish) {
state.Finish = true;
continue;
}
if (!state.Prev) {
state.Prev = std::move(item);
continue;
}
Item->SetValue(CompCtx, std::move(*state.Prev));
state.Prev = item;
NextItem->SetValue(CompCtx, std::move(item));
result = NewItem->GetValue(CompCtx);
break;
}
return NUdf::EFetchStatus::Ok;
}
TState& GetState() const {
auto& result = CompCtx.MutableValues[StateIndex];
if (!result.HasValue()) {
result = CompCtx.HolderFactory.Create<TState>();
}
return *static_cast<TState*>(result.AsBoxed().Get());
}
TComputationContext& CompCtx;
const NUdf::TUnboxedValue Stream;
IComputationExternalNode* const Item;
IComputationExternalNode* const NextItem;
IComputationNode* const NewItem;
const ui32 StateIndex;
};
IComputationNode* const Stream;
IComputationExternalNode* const Item;
IComputationExternalNode* const NextItem;
IComputationNode* const NewItem;
const ui32 StateIndex;
};
}
IComputationNode* WrapMapNext(TCallable& callable, const TComputationNodeFactoryContext& ctx) {
MKQL_ENSURE(callable.GetInputsCount() == 4, "Expected 4 args, got " << callable.GetInputsCount());
const auto type = callable.GetType()->GetReturnType();
const auto input = LocateNode(ctx.NodeLocator, callable, 0);
const auto itemArg = LocateExternalNode(ctx.NodeLocator, callable, 1);
const auto nextItemArg = LocateExternalNode(ctx.NodeLocator, callable, 2);
const auto newItem = LocateNode(ctx.NodeLocator, callable, 3);
if (type->IsFlow()) {
return new TFlowMapNextWrapper(ctx.Mutables, GetValueRepresentation(type), input, itemArg, nextItemArg, newItem);
} else if (type->IsStream()) {
return new TStreamMapNextWrapper(ctx.Mutables, input, itemArg, nextItemArg, newItem);
}
THROW yexception() << "Expected flow or stream.";
}
}
}
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