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#include "match_recognize.h"
#include "source.h"
#include "context.h"
namespace NSQLTranslationV1 {
namespace {
const auto VarDataName = "data";
const auto VarMatchedVarsName = "vars";
const auto VarLastRowIndexName = "lri";
} //namespace {
class TMatchRecognize: public TAstListNode {
public:
TMatchRecognize(
TPosition pos,
ISource* source,
const TString& inputTable,
std::pair<TPosition, TVector<TNamedFunction>>&& partitioners,
std::pair<TPosition, TVector<TSortSpecificationPtr>>&& sortSpecs,
std::pair<TPosition, TVector<TNamedFunction>>&& measures,
std::pair<TPosition, ERowsPerMatch>&& rowsPerMatch,
std::pair<TPosition, NYql::NMatchRecognize::TAfterMatchSkipTo>&& skipTo,
std::pair<TPosition, NYql::NMatchRecognize::TRowPattern>&& pattern,
std::pair<TPosition, TNodePtr>&& subset,
std::pair<TPosition, TVector<TNamedFunction>>&& definitions
): TAstListNode(pos, {BuildAtom(pos, "block")})
{
Add(BuildBlockStatements(
pos,
source,
inputTable,
std::move(partitioners),
std::move(sortSpecs),
std::move(measures),
std::move(rowsPerMatch),
std::move(skipTo),
std::move(pattern),
std::move(subset),
std::move(definitions)
));
}
private:
TMatchRecognize(const TMatchRecognize& other)
: TAstListNode(other.Pos)
{
Nodes = CloneContainer(other.Nodes);
}
TNodePtr BuildBlockStatements(
TPosition pos,
ISource* source,
const TString& inputTable,
std::pair<TPosition, TVector<TNamedFunction>>&& partitioners,
std::pair<TPosition, TVector<TSortSpecificationPtr>>&& sortSpecs,
std::pair<TPosition, TVector<TNamedFunction>>&& measures,
std::pair<TPosition, ERowsPerMatch>&& rowsPerMatch,
std::pair<TPosition, NYql::NMatchRecognize::TAfterMatchSkipTo>&& skipTo,
std::pair<TPosition, NYql::NMatchRecognize::TRowPattern>&& pattern,
std::pair<TPosition, TNodePtr>&& subset,
std::pair<TPosition, TVector<TNamedFunction>>&& definitions
) {
Y_UNUSED(pos);
auto inputRowType = Y("ListItemType",Y("TypeOf", inputTable));
auto patternNode = Pattern(pattern.first, pattern.second);
auto partitionColumns = Y();
for (const auto& p: partitioners.second){
partitionColumns->Add(BuildQuotedAtom(p.callable->GetPos(), p.name));
}
partitionColumns = Q(partitionColumns);
auto partitionKeySelector = Y();
for (const auto& p: partitioners.second){
partitionKeySelector->Add(p.callable);
}
partitionKeySelector = BuildLambda(partitioners.first, Y("row"), Q(partitionKeySelector));
auto measureNames = Y();
for (const auto& m: measures.second){
measureNames->Add(BuildQuotedAtom(m.callable->GetPos(), m.name));
}
TNodePtr measuresNode = Y("MatchRecognizeMeasures", inputRowType, patternNode, Q(measureNames));
for (const auto& m: measures.second){
measuresNode->Add(BuildLambda(m.callable->GetPos(), Y(VarDataName, VarMatchedVarsName), m.callable));
}
auto defineNames = Y();
for (const auto& d: definitions.second) {
defineNames->Add(BuildQuotedAtom(d.callable->GetPos(), d.name));
}
TNodePtr defineNode = Y("MatchRecognizeDefines", inputRowType, patternNode, Q(defineNames));
for (const auto& d: definitions.second) {
defineNode->Add(BuildLambda(d.callable->GetPos(), Y(VarDataName, VarMatchedVarsName, VarLastRowIndexName), d.callable));
}
return Q(Y(
Y("let", "input", inputTable),
Y("let", "partitionKeySelector", partitionKeySelector),
Y("let", "partitionColumns", partitionColumns),
Y("let", "sortTraits", sortSpecs.second.empty()? Y("Void") : source->BuildSortSpec(sortSpecs.second, inputTable, true, false)),
Y("let", "measures", measuresNode),
Y("let", "rowsPerMatch", BuildQuotedAtom(rowsPerMatch.first, "RowsPerMatch_" + ToString(rowsPerMatch.second))),
Y("let", "skipTo", BuildTuple(skipTo.first, {Q("AfterMatchSkip_" + ToString(skipTo.second.To)), Q(ToString(skipTo.second.Var))})),
Y("let", "pattern", patternNode),
Y("let", "subset", subset.second ? subset.second : Q("")),
Y("let", "define", defineNode),
Y("let", "res", Y("MatchRecognize",
"input",
"partitionKeySelector",
"partitionColumns",
"sortTraits",
Y("MatchRecognizeParams",
"measures",
"rowsPerMatch",
"skipTo",
"pattern",
"define"
)
)),
Y("return", "res")
));
}
TPtr PatternFactor(const TPosition& pos, const NYql::NMatchRecognize::TRowPatternFactor& factor) {
return BuildTuple(pos, {
factor.Primary.index() == 0 ?
BuildQuotedAtom(pos, std::get<0>(factor.Primary)) :
Pattern(pos, std::get<1>(factor.Primary)),
BuildQuotedAtom(pos, ToString(factor.QuantityMin)),
BuildQuotedAtom(pos, ToString(factor.QuantityMax)),
BuildQuotedAtom(pos, ToString(factor.Greedy)),
BuildQuotedAtom(pos, ToString(factor.Output)),
BuildQuotedAtom(pos, ToString(factor.Unused))
});
}
TPtr PatternTerm(const TPosition& pos, const NYql::NMatchRecognize::TRowPatternTerm& term) {
auto factors = Y();
for (const auto& f: term)
factors->Add(PatternFactor(pos, f));
return Q(std::move(factors));
}
TPtr Pattern(const TPosition& pos, const NYql::NMatchRecognize::TRowPattern& pattern) {
TNodePtr patternNode = Y("MatchRecognizePattern");
for (const auto& t: pattern) {
patternNode->Add(PatternTerm(pos, t));
}
return patternNode;
}
TPtr DoClone() const final{
return new TMatchRecognize(*this);
}
};
TNodePtr TMatchRecognizeBuilder::Build(TContext& ctx, TString&& inputTable, ISource* source){
TNodePtr node = new TMatchRecognize(
Pos,
source,
std::move(inputTable),
std::move(Partitioners),
std::move(SortSpecs),
std::move(Measures),
std::move(RowsPerMatch),
std::move(SkipTo),
std::move(Pattern),
std::move(Subset),
std::move(Definitions)
);
if (!node->Init(ctx, source))
return nullptr;
return node;
}
namespace {
const auto DefaultNavigatingFunction = "MatchRecognizeDefaultNavigating";
}
bool TMatchRecognizeVarAccessNode::DoInit(TContext& ctx, ISource* src) {
//If referenced var is the var that is currently being defined
//then it's a reference to the last row in a partition
Node = new TMatchRecognizeNavigate(ctx.Pos(), DefaultNavigatingFunction, TVector<TNodePtr>{this->Clone()});
return Node->Init(ctx, src);
}
bool TMatchRecognizeNavigate::DoInit(TContext& ctx, ISource* src) {
Y_UNUSED(src);
if (Args.size() != 1) {
ctx.Error(Pos) << "Exactly one argument is required in MATCH_RECOGNIZE navigation function";
return false;
}
const auto varColumn = dynamic_cast<TMatchRecognizeVarAccessNode *>(Args[0].Get());
if (not varColumn) {
ctx.Error(Pos) << "Row pattern navigation operations are applicable to row pattern variable only";
return false;
}
const auto varData = BuildAtom(ctx.Pos(), VarDataName);
const auto varMatchedVars = BuildAtom(ctx.Pos(), VarMatchedVarsName);
const auto varLastRowIndex = BuildAtom(ctx.Pos(), VarLastRowIndexName);
const auto matchedRanges = Y("Member", varMatchedVars, Q(varColumn->GetVar()));
TNodePtr navigatedRowIndex;
if (DefaultNavigatingFunction == Name) {
if (not varColumn->IsTheSameVar()) {
ctx.Error(Pos) << "Row pattern navigation function is required";
return false;
}
navigatedRowIndex = varLastRowIndex;
}
else if ("PREV" == Name) {
if (not varColumn->IsTheSameVar()) {
ctx.Error(Pos) << "PREV relative to matched vars is not implemented yet";
return false;
}
navigatedRowIndex = Y(
"-",
varLastRowIndex,
Y("Uint64", Q("1"))
);
} else if ("FIRST" == Name) {
navigatedRowIndex = Y(
"Member",
Y("Head", matchedRanges),
Q("From")
);
} else if ("LAST" == Name) {
navigatedRowIndex = Y(
"Member",
Y("Last", matchedRanges),
Q("To")
);
} else {
ctx.Error(Pos) << "Internal logic error";
return false;
}
Add("Member");
Add(
Y(
"Lookup",
Y("ToIndexDict", varData),
navigatedRowIndex
)
),
Add(Q(varColumn->GetColumn()));
return true;
}
} // namespace NSQLTranslationV1
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