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#include "dq_sink.h"
#include "dq_transport.h"
#include <ydb/library/yql/utils/yql_panic.h>
#include <deque>
#include <variant>
namespace NYql::NDq {
namespace {
class TDqSink : public IDqSink {
struct TValueDesc {
std::variant<NUdf::TUnboxedValue, NDqProto::TCheckpoint> Value;
ui64 EstimatedSize;
TValueDesc(NUdf::TUnboxedValue&& value, ui64 size)
: Value(std::move(value))
, EstimatedSize(size)
{
}
TValueDesc(NDqProto::TCheckpoint&& checkpoint, ui64 size)
: Value(std::move(checkpoint))
, EstimatedSize(size)
{
}
TValueDesc(const TValueDesc&) = default;
TValueDesc(TValueDesc&&) = default;
};
public:
TDqSink(ui64 outputIndex, NKikimr::NMiniKQL::TType* outputType, ui64 maxStoredBytes, bool collectProfileStats)
: OutputIndex(outputIndex)
, MaxStoredBytes(maxStoredBytes)
, OutputType(outputType)
, BasicStats(OutputIndex)
, ProfileStats(collectProfileStats ? &BasicStats : nullptr) {}
ui64 GetOutputIndex() const override {
return OutputIndex;
}
bool IsFull() const override {
return EstimatedStoredBytes >= MaxStoredBytes;
}
void Push(NUdf::TUnboxedValue&& value) override {
if (!BasicStats.FirstRowIn) {
BasicStats.FirstRowIn = TInstant::Now();
}
if (ValuesPushed++ % 1000 == 0) {
ReestimateRowBytes(value);
}
Y_VERIFY(EstimatedRowBytes > 0);
Values.emplace_back(std::move(value), EstimatedRowBytes);
EstimatedStoredBytes += EstimatedRowBytes;
ReportChunkIn();
}
void Push(NDqProto::TCheckpoint&& checkpoint) override {
const ui64 bytesSize = checkpoint.ByteSize();
Values.emplace_back(std::move(checkpoint), bytesSize);
EstimatedStoredBytes += bytesSize;
ReportChunkIn();
}
void Finish() override {
Finished = true;
if (!BasicStats.FirstRowIn) {
BasicStats.FirstRowIn = TInstant::Now();
}
}
ui64 Pop(NKikimr::NMiniKQL::TUnboxedValueVector& batch, ui64 bytes) override {
batch.clear();
ui64 valuesCount = 0;
ui64 usedBytes = 0;
// Calc values count.
for (auto iter = Values.cbegin(), end = Values.cend();
usedBytes < bytes && iter != end && std::holds_alternative<NUdf::TUnboxedValue>(iter->Value);
++iter)
{
++valuesCount;
usedBytes += iter->EstimatedSize;
}
// Reserve size and return data.
batch.reserve(valuesCount);
while (valuesCount--) {
batch.emplace_back(std::move(std::get<NUdf::TUnboxedValue>(Values.front().Value)));
Values.pop_front();
}
Y_VERIFY(EstimatedStoredBytes >= usedBytes);
EstimatedStoredBytes -= usedBytes;
ReportChunkOut(batch.size(), usedBytes);
return usedBytes;
}
bool Pop(NDqProto::TCheckpoint& checkpoint) override {
if (!Values.empty() && std::holds_alternative<NDqProto::TCheckpoint>(Values.front().Value)) {
checkpoint = std::move(std::get<NDqProto::TCheckpoint>(Values.front().Value));
const auto size = Values.front().EstimatedSize;
Y_VERIFY(EstimatedStoredBytes >= size);
EstimatedStoredBytes -= size;
Values.pop_front();
ReportChunkOut(1, size);
return true;
}
return false;
}
bool HasData() const override {
return EstimatedRowBytes > 0;
}
bool IsFinished() const override {
if (!Finished) {
return false;
}
for (const TValueDesc& v : Values) {
if (std::holds_alternative<NUdf::TUnboxedValue>(v.Value)) {
return false;
}
}
// Finished and no data values.
return true;
}
NKikimr::NMiniKQL::TType* GetOutputType() const override {
return OutputType;
}
const TDqSinkStats* GetStats() const override {
return &BasicStats;
}
private:
void ReestimateRowBytes(const NUdf::TUnboxedValue& value) {
const ui64 valueSize = TDqDataSerializer::EstimateSize(value, OutputType);
if (EstimatedRowBytes) {
EstimatedRowBytes = static_cast<ui64>(0.6 * valueSize + 0.4 * EstimatedRowBytes);
} else {
EstimatedRowBytes = valueSize;
}
if (!EstimatedRowBytes) {
EstimatedRowBytes = 1;
}
}
void ReportChunkIn() {
BasicStats.Bytes += EstimatedRowBytes;
BasicStats.RowsIn++;
if (ProfileStats) {
ProfileStats->MaxMemoryUsage = std::max(ProfileStats->MaxMemoryUsage, EstimatedStoredBytes);
ProfileStats->MaxRowsInMemory = std::max(ProfileStats->MaxRowsInMemory, Values.size());
}
}
void ReportChunkOut(ui64 rowsCount, ui64 /* usedBytes */) {
BasicStats.Chunks++;
BasicStats.RowsOut += rowsCount;
}
private:
const ui64 OutputIndex;
const ui64 MaxStoredBytes;
NKikimr::NMiniKQL::TType* const OutputType;
ui64 EstimatedStoredBytes = 0;
ui64 ValuesPushed = 0;
bool Finished = false;
std::deque<TValueDesc> Values;
ui64 EstimatedRowBytes = 0;
TDqSinkStats BasicStats;
TDqSinkStats* ProfileStats = nullptr;
};
} // namespace
IDqSink::TPtr CreateDqSink(ui64 outputIndex, NKikimr::NMiniKQL::TType* outputType, ui64 maxStoredBytes,
bool collectProfileStats)
{
return MakeIntrusive<TDqSink>(outputIndex, outputType, maxStoredBytes, collectProfileStats);
}
} // namespace NYql::NDq
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