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#include "yql_optimize.h"
#include <ydb/library/yql/utils/log/log.h>
#include <ydb/library/yql/utils/yql_panic.h>
#include <util/generic/hash_set.h>
#include <util/generic/yexception.h>
namespace NYql {
using namespace NNodes;
class TOptimizeTransformerBase::TIgnoreOptimizationContext: public IOptimizationContext {
public:
TIgnoreOptimizationContext(TOptimizeTransformerBase::TGetParents getParents)
: GetParents(std::move(getParents))
{
}
virtual ~TIgnoreOptimizationContext() = default;
void RemapNode(const TExprNode& src, const TExprNode::TPtr&) final {
const TParentsMap* parentsMap = GetParents();
auto parentsIt = parentsMap->find(&src);
YQL_ENSURE(parentsIt != parentsMap->cend());
YQL_ENSURE(parentsIt->second.size() == 1, "Bad usage of local optimizer. Try to switch to global mode");
}
private:
TOptimizeTransformerBase::TGetParents GetParents;
};
class TOptimizeTransformerBase::TRemapOptimizationContext: public IOptimizationContext {
public:
TRemapOptimizationContext(TNodeOnNodeOwnedMap& remaps)
: Remaps_(remaps)
{
}
virtual ~TRemapOptimizationContext() = default;
void RemapNode(const TExprNode& fromNode, const TExprNode::TPtr& toNode) final {
YQL_ENSURE(Remaps_.emplace(&fromNode, toNode).second, "Duplicate remap of the same node");
}
void SetError() {
HasError_ = true;
}
bool CanContinue() const {
return Remaps_.empty() && !HasError_;
}
bool HasError() const {
return HasError_;
}
private:
TNodeOnNodeOwnedMap& Remaps_;
bool HasError_ = false;
};
TOptimizeTransformerBase::TOptimizeTransformerBase(TTypeAnnotationContext* types, NLog::EComponent logComponent, const TSet<TString>& disabledOpts)
: Types(types)
, LogComponent(logComponent)
, DisabledOpts(disabledOpts)
{
}
IGraphTransformer::TStatus TOptimizeTransformerBase::DoTransform(TExprNode::TPtr input, TExprNode::TPtr& output, TExprContext& ctx) {
TOptimizeExprSettings settings(Types);
IGraphTransformer::TStatus status = IGraphTransformer::TStatus::Ok;
output = input;
for (auto& step: Steps) {
TParentsMap parentsMap;
bool parentsMapInit = false;
TGetParents getParents = [&input, &parentsMap, &parentsMapInit] () {
if (!parentsMapInit) {
GatherParents(*input, parentsMap);
parentsMapInit = true;
}
return &parentsMap;
};
if (step.Global) {
TNodeOnNodeOwnedMap remaps;
auto optCtx = TRemapOptimizationContext{remaps};
VisitExpr(output,
[&optCtx, &step](const TExprNode::TPtr& node) {
return optCtx.CanContinue() && !node->StartsExecution() && !step.ProcessedNodes.contains(node->UniqueId());
},
[this, &step, &getParents, &ctx, &optCtx](const TExprNode::TPtr& node) -> bool {
if (optCtx.CanContinue() && !node->StartsExecution() && !step.ProcessedNodes.contains(node->UniqueId())) {
for (auto& opt: step.Optimizers) {
if (opt.Filter(node.Get())) {
try {
auto ret = opt.Handler(NNodes::TExprBase(node), ctx, optCtx, getParents);
if (!ret) {
YQL_CVLOG(NLog::ELevel::ERROR, LogComponent) << "Error applying " << opt.OptName;
optCtx.SetError();
} else if (auto retNode = ret.Cast(); retNode.Ptr() != node) {
YQL_CVLOG(NLog::ELevel::INFO, LogComponent) << opt.OptName;
optCtx.RemapNode(*node, retNode.Ptr());
}
} catch (...) {
YQL_CVLOG(NLog::ELevel::ERROR, LogComponent) << "Error applying " << opt.OptName << ": " << CurrentExceptionMessage();
throw;
}
}
if (!optCtx.CanContinue()) {
break;
}
}
if (optCtx.CanContinue()) {
step.ProcessedNodes.insert(node->UniqueId());
}
}
return true;
}
);
if (optCtx.HasError()) {
status = IGraphTransformer::TStatus::Error;
} else if (!remaps.empty()) {
settings.ProcessedNodes = nullptr;
status = RemapExpr(output, output, remaps, ctx, settings);
}
} else {
settings.ProcessedNodes = &step.ProcessedNodes;
status = OptimizeExpr(output, output, [this, &step, &getParents](const TExprNode::TPtr& node, TExprContext& ctx) -> TExprNode::TPtr {
TIgnoreOptimizationContext ignoreOptCtx(getParents);
for (auto& opt: step.Optimizers) {
if (opt.Filter(node.Get())) {
try {
auto ret = opt.Handler(NNodes::TExprBase(node), ctx, ignoreOptCtx, getParents);
if (!ret) {
YQL_CVLOG(NLog::ELevel::ERROR, LogComponent) << "Error applying " << opt.OptName;
return {};
}
auto retNode = ret.Cast();
if (retNode.Ptr() != node) {
YQL_CVLOG(NLog::ELevel::INFO, LogComponent) << opt.OptName;
return retNode.Ptr();
}
} catch (...) {
YQL_CVLOG(NLog::ELevel::ERROR, LogComponent) << "Error applying " << opt.OptName << ": " << CurrentExceptionMessage();
throw;
}
}
}
return node;
}, ctx, settings);
}
if (status.Level != IGraphTransformer::TStatus::Ok) {
return status;
}
}
return status;
}
void TOptimizeTransformerBase::Rewind() {
for (auto& step: Steps) {
step.ProcessedNodes.clear();
}
}
TOptimizeTransformerBase::TFilter TOptimizeTransformerBase::Any() {
return [] (const TExprNode* node) {
Y_UNUSED(node);
return true;
};
}
TOptimizeTransformerBase::TFilter TOptimizeTransformerBase::Names(std::initializer_list<TStringBuf> names) {
return [filter = THashSet<TStringBuf>(names)] (const TExprNode* node) {
return node->IsCallable(filter);
};
}
TOptimizeTransformerBase::TFilter TOptimizeTransformerBase::Or(std::initializer_list<TOptimizeTransformerBase::TFilter> filters) {
return [orFilters = TVector<TFilter>(filters)] (const TExprNode* node) {
for (auto& f: orFilters) {
if (f(node)) {
return true;
}
}
return false;
};
}
void TOptimizeTransformerBase::AddHandler(size_t step, TFilter filter, TStringBuf optName, THandler handler) {
if (DisabledOpts.contains(optName)) {
return;
}
if (step >= Steps.size()) {
Steps.resize(step + 1);
}
TOptInfo opt;
opt.OptName = optName;
opt.Filter = filter;
opt.Handler = handler;
Steps[step].Optimizers.push_back(std::move(opt));
}
void TOptimizeTransformerBase::SetGlobal(size_t step) {
if (step >= Steps.size()) {
Steps.resize(step + 1);
}
Steps[step].Global = true;
}
}
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