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#include "yql_opt_window_stream_transformers.h"
#include <yql/essentials/core/sql_types/sort_order.h>
#include <yql/essentials/core/expr_nodes/yql_expr_nodes.h>
#include <yql/essentials/core/yql_opt_utils.h>
#include <yql/essentials/core/yql_window_frame_settings.h>
namespace NYql {
namespace {
constexpr TStringBuf SortedColumnMemberName = "_yql_sorted_column";
auto ForEachRangeFrame(const TExprNode::TPtr& frames, TExprContext& ctx, std::function<void(const TWindowFrameSettings::TRangeFrame&)> func) {
for (auto& winOn : frames->ChildrenList()) {
if (NNodes::TCoWinOnRange::Match(winOn.Get())) {
func(TWindowFrameSettings::Parse(*winOn, ctx).GetRangeFrame());
}
}
}
ESortOrder ExtractAndVerifyRangeSortOrder(const TExprNode::TPtr& frames, TExprContext& ctx) {
TMaybe<ESortOrder> sortOrder;
ForEachRangeFrame(frames, ctx, [&](const TWindowFrameSettings::TRangeFrame& rangeFrame) {
if (!sortOrder) {
sortOrder = rangeFrame.GetSortOrder();
} else {
YQL_ENSURE(*sortOrder == rangeFrame.GetSortOrder(), "All Range frames must have the same SortOrder");
}
});
return sortOrder.GetOrElse(ESortOrder::Unimportant);
}
TMaybe<const TTypeAnnotationNode*> GetSortedColumnType(const TExprNode::TPtr& sortTraits) {
if (!sortTraits || sortTraits->IsCallable("Void")) {
return {};
}
YQL_ENSURE(sortTraits->IsCallable("SortTraits"));
auto sortKeyLambda = sortTraits->ChildPtr(2);
YQL_ENSURE(sortKeyLambda->IsLambda());
const TTypeAnnotationNode* sortKeyType = sortKeyLambda->GetTypeAnn();
YQL_ENSURE(sortKeyType);
return sortKeyType;
}
TMaybe<std::pair<TExprNode::TPtr, TNodeTransform>> GetSortedBoundNodeKeyForDedup(const TWindowFrameSettingBound& bound) {
if (!bound.IsFinite()) {
return {};
}
if (!bound.GetUnderlyingValue().GetColumnCast()){
return {};
}
return std::make_pair(bound.GetUnderlyingValue().GetFrameBound(), *bound.GetUnderlyingValue().GetColumnCast());
};
} // namespace
TWindowSortedColumnPusher::TWindowSortedColumnPusher(const TExprNode::TPtr& sortTraits, TExprContext& ctx, const TExprNode::TPtr& frames)
: Ctx_(ctx)
{
SortOrder_ = ExtractAndVerifyRangeSortOrder(frames, ctx);
SortColumnType_ = GetSortedColumnType(sortTraits);
ForEachRangeFrame(frames, ctx, [&](const TWindowFrameSettings::TRangeFrame& rangeFrame) {
auto boundForDedup = {GetSortedBoundNodeKeyForDedup(rangeFrame.GetFirst()), GetSortedBoundNodeKeyForDedup(rangeFrame.GetLast())};
for (auto boundNodeAndTransform : boundForDedup) {
if (boundNodeAndTransform) {
// Insert with deduplication for the same functions.
MappedSortedColumnsToNames_.emplace(
boundNodeAndTransform->first,
std::make_pair(boundNodeAndTransform->second, TString(TStringBuilder() << SortedColumnMemberName << "_" << MappedSortedColumnsToNames_.size() + 1)));
}
}
});
}
std::pair<TStringBuf, TStringBuf> TWindowSortedColumnPusher::GetRangeSortedColumnNames(const TWindowFrameSettings::TRangeFrame& rangeFrame) const {
YQL_ENSURE(ShouldAddSortedColumn(), "SortOrder is unimportant, but range frame is provided");
auto getSortedColumnName = [this](const TMaybe<std::pair<TExprNode::TPtr, TNodeTransform>>& boundNodeAndTransform) -> TStringBuf {
if (boundNodeAndTransform) {
auto it = MappedSortedColumnsToNames_.find(boundNodeAndTransform->first);
YQL_ENSURE(it != MappedSortedColumnsToNames_.end(), "Sorted column cast function not found.");
const auto& [boundNode, transformAndColumnName] = *it;
const auto& [transform, columnName] = transformAndColumnName;
return columnName;
}
return SortedColumnMemberName;
};
return {getSortedColumnName(GetSortedBoundNodeKeyForDedup(rangeFrame.GetFirst())),
getSortedColumnName(GetSortedBoundNodeKeyForDedup(rangeFrame.GetLast()))};
}
TVector<TStringBuf> TWindowSortedColumnPusher::GetAllSortedColumnNames() const {
TVector<TStringBuf> sortedColumns;
if (!ShouldAddSortedColumn()) {
YQL_ENSURE(MappedSortedColumnsToNames_.empty(), "No sort column type is provided, but extrasorted columns are provided");
return sortedColumns;
}
sortedColumns.reserve(MappedSortedColumnsToNames_.size() + 1);
sortedColumns.push_back(SortedColumnMemberName);
std::transform(MappedSortedColumnsToNames_.begin(), MappedSortedColumnsToNames_.end(), std::back_inserter(sortedColumns), [](const auto& item) {
const auto& [keyNode, transformAndColumnName] = item;
const auto& [transform, columnName] = transformAndColumnName;
return columnName;
});
std::sort(sortedColumns.begin(), sortedColumns.end(), [](const auto& a, const auto& b) {
return a < b;
});
return sortedColumns;
}
bool TWindowSortedColumnPusher::ShouldAddSortedColumn() const {
return SortOrder() != ESortOrder::Unimportant;
}
ESortOrder TWindowSortedColumnPusher::SortOrder() const {
return SortOrder_;
}
TExprNode::TPtr TWindowSortedColumnPusher::GetStreamWithSortedColumns(TExprNode::TPtr stream, TExprNode::TPtr sortKeySelector) const {
if (!ShouldAddSortedColumn()) {
return stream;
}
return AddSortedColumnsToStream(stream, sortKeySelector);
}
TExprNode::TPtr TWindowSortedColumnPusher::AddSortedColumnsToStream(TExprNode::TPtr stream, TExprNode::TPtr sortKeySelector) const {
auto pos = stream->Pos();
// If sortKeySelector is Void, nothing to do.
if (sortKeySelector->IsCallable("Void")) {
return stream;
}
// clang-format off
// Add sorted column to the input stream using Map.
auto rowArg = Ctx_.NewArgument(pos, "row");
auto addMemberBody = Ctx_.Builder(pos)
.Callable("AddMember")
.Add(0, rowArg)
.Atom(1, SortedColumnMemberName)
.Apply(2, Ctx_.DeepCopyLambda(*sortKeySelector))
.With(0, rowArg)
.Seal()
.Seal()
.Build();
if (!MappedSortedColumnsToNames_.empty()) {
auto makePrefixStruct = [this, pos](const TExprNode::TPtr& structNode) {
return Ctx_.Builder(pos)
.List()
.Atom(0, "")
.Add(1, structNode)
.Seal()
.Build();
};
auto newFieldsAsStruct = Ctx_.Builder(pos)
.Callable("AsStruct")
.Do([&](TExprNodeBuilder& parent) -> TExprNodeBuilder& {
ui32 i = 0U;
for (const auto& [keyNode, transformAndColumnName] : MappedSortedColumnsToNames_) {
const auto& [transform, columnName] = transformAndColumnName;
auto sortedColumnValue = Ctx_.Builder(pos)
.Callable("Member")
.Add(0, addMemberBody)
.Atom(1, SortedColumnMemberName)
.Seal()
.Build();
auto memberValue = transform(sortedColumnValue, Ctx_);
parent.List(i)
.Atom(0, columnName)
.Add(1, memberValue)
.Seal();
++i;
}
return parent;
})
.Seal()
.Build();
addMemberBody = Ctx_.NewCallable(pos, "FlattenMembers", TExprNode::TListType{
makePrefixStruct(addMemberBody),
makePrefixStruct(newFieldsAsStruct)
});
}
auto addMemberLambda = Ctx_.NewLambda(pos, Ctx_.NewArguments(pos, {rowArg}), std::move(addMemberBody));
auto streamWithSortedColumn = Ctx_.Builder(pos)
.Callable("OrderedMap")
.Add(0, stream)
.Add(1, addMemberLambda)
.Seal()
.Build();
return streamWithSortedColumn;
// clang-format on
}
TExprNode::TPtr TWindowSortedColumnPusher::ClearStreamFromSortedColumns(TExprNode::TPtr stream) const {
if (!ShouldAddSortedColumn()) {
return stream;
}
auto pos = stream->Pos();
auto rowArg = Ctx_.NewArgument(pos, "row");
auto body = RemoveMembers(pos, rowArg, GetAllSortedColumnNames(), Ctx_);
auto lambda = Ctx_.NewLambda(pos, Ctx_.NewArguments(pos, {rowArg}), std::move(body));
// clang-format off
return Ctx_.Builder(pos)
.Callable("OrderedMap")
.Add(0, stream)
.Add(1, lambda)
.Seal()
.Build();
// clang-format on
}
} // namespace NYql
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