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#include "yql_sqlselect.h"
#include <yql/essentials/core/yql_expr_optimize.h>
#include <yql/essentials/core/yql_module_helpers.h>
namespace NYql {
TExprNode::TPtr ExpandYqlTraitsFactory(
const TExprNode::TPtr& factory,
TExprNode::TPtr listType,
TExprNode::TPtr extractor,
TExprContext& ctxExpr,
TTypeAnnotationContext& ctxTypes)
{
TString name(factory->Child(0)->Content());
TString module;
if (factory->IsCallable("YqlAggFactory")) {
module = "aggregate";
} else if (factory->IsCallable("YqlWinFactory")) {
module = "window";
} else {
YQL_ENSURE(false, "Unexpected " << factory->Content());
}
TString path = "/lib/yql/" + module + ".yqls";
TString binding = name + "_traits_factory";
TExprNode::TPtr traitsFactory = ImportDeeplyCopied(
factory->Child(0)->Pos(ctxExpr),
path, binding, ctxExpr, ctxTypes);
YQL_ENSURE(traitsFactory);
// clang-format off
TExprNode::TPtr traits = ctxExpr.Builder(factory->Pos())
.Apply(std::move(traitsFactory))
.With(0, std::move(listType))
.With(1, std::move(extractor))
.Seal()
.Build();
// clang-format on
ctxExpr.Step.Repeat(TExprStep::ExpandApplyForLambdas);
auto status = ExpandApplyNoRepeat(traits, traits, ctxExpr);
YQL_ENSURE(status == IGraphTransformer::TStatus::Ok);
return traits;
}
size_t DefValIndex(const TExprNode::TPtr& traits) {
if (traits->IsCallable("AggregationTraits")) {
return 7;
}
if (traits->IsCallable("WindowTraits")) {
return 5;
}
YQL_ENSURE(false, "unexpected " << traits->Content());
}
TExprNode::TPtr ExpandResultType(
const TExprNode::TPtr& traits,
const TExprNode::TPtr& body,
TExprContext& ctxExpr)
{
const size_t defValIndex = DefValIndex(traits);
// clang-format off
TExprNode::TPtr init = ctxExpr.Builder(traits->Pos())
.Apply(traits->Child(1))
.With(0, std::move(body))
.Seal()
.Build();
// clang-format on
TExprNode::TPtr defVal = traits->ChildPtr(defValIndex);
const bool isDefault = !defVal->IsCallable("Null");
TExprNode::TPtr finish;
if (!isDefault) {
// clang-format off
finish = ctxExpr.Builder(traits->Pos())
.Apply(traits->Child(defValIndex - 1))
.With(0, std::move(init))
.Seal()
.Build();
// clang-format on
} else if (defVal->IsLambda()) {
ctxExpr.AddError(TIssue(
traits->Pos(ctxExpr),
TStringBuilder()
<< "An aggregation with a lambda DefVal "
<< "is not yet supported"));
return nullptr;
} else {
finish = std::move(defVal);
}
// clang-format off
return ctxExpr.Builder(traits->Pos())
.Callable("TypeOf")
.Add(0, std::move(finish))
.Seal()
.Build();
// clang-format on
}
TExprNode::TPtr ExpandSqlWindowCall(
const TExprNode::TPtr& call,
TExprNode::TPtr listType,
TExprNode::TPtr keyExtractor,
TAggsRewriter rewrite,
TExprContext& ctxExpr,
TTypeAnnotationContext& ctxTypes)
{
YQL_ENSURE(call->IsCallable({"PgWindowCall", "YqlWin"}));
const bool isYql = call->IsCallable("YqlWin");
TString name(call->Child(0)->Content());
SubstGlobal(name, "_", "");
const size_t argsOffset = isYql ? 4 : 3;
YQL_ENSURE(argsOffset <= call->ChildrenSize());
const size_t argsCount = call->ChildrenSize() - argsOffset;
const auto argAt = [&](size_t index) -> TExprNode::TPtr {
return call->Child(argsOffset + index);
};
if (name == "rownumber" && argsCount == 0) {
// clang-format off
return ctxExpr.Builder(call->Pos())
.Callable("RowNumber")
.Add(0, std::move(listType))
.Seal()
.Build();
// clang-format on
}
if (name == "cumedist" && argsCount == 0) {
// clang-format off
return ctxExpr.Builder(call->Pos())
.Callable("CumeDist")
.Add(0, std::move(listType))
.List(1)
.List(0)
.Atom(0, "ansi")
.Seal()
.Seal()
.Seal()
.Build();
// clang-format on
}
if (name == "ntile" && argsCount == 1) {
TExprNode::TPtr arg = argAt(0);
if (!isYql) {
// clang-format off
arg = ctxExpr.Builder(arg->Pos())
.Callable("Unwrap")
.Callable(0, "FromPg")
.Add(0, std::move(arg))
.Seal()
.Seal()
.Build();
// clang-format on
}
// clang-format off
return ctxExpr.Builder(call->Pos())
.Callable("NTile")
.Add(0, std::move(listType))
.Add(1, std::move(arg))
.Seal()
.Build();
// clang-format on
}
if ((name == "rank" || name == "denserank" || name == "percentrank") &&
((isYql && argsCount <= 1) || (!isYql && argsCount == 0)))
{
TStringBuf callable;
if (name == "rank") {
callable = "Rank";
} else if (name == "denserank") {
callable = "DenseRank";
} else if (name == "percentrank") {
callable = "PercentRank";
} else {
YQL_ENSURE(false, "unexpected " << name);
}
// clang-format off
return ctxExpr.Builder(call->Pos())
.Callable(callable)
.Add(0, std::move(listType))
.Add(1, keyExtractor)
.List(2)
.List(0)
.Atom(0, "ansi")
.Seal()
.Seal()
.Seal()
.Build();
// clang-format on
}
if ((name == "lead" || name == "lag") &&
((isYql && argsCount <= 2) || (!isYql && argsCount == 1)))
{
TExprNode::TPtr row = ctxExpr.NewArgument(call->Pos(), "row");
TExprNode::TPtr arg = argAt(0);
arg = rewrite(arg, row);
TExprNode::TPtr offset = (argsCount == 2) ? argAt(1) : nullptr;
TExprNode::TPtr extractor = ctxExpr.NewLambda(
arg->Pos(), ctxExpr.NewArguments(call->Pos(), {row}), std::move(arg));
if (offset) {
// clang-format off
return ctxExpr.Builder(call->Pos())
.Callable(name == "lead" ? "Lead" : "Lag")
.Add(0, std::move(listType))
.Add(1, std::move(extractor))
.Add(2, std::move(offset))
.Seal()
.Build();
// clang-format on
}
// clang-format off
return ctxExpr.Builder(call->Pos())
.Callable(name == "lead" ? "Lead" : "Lag")
.Add(0, std::move(listType))
.Add(1, std::move(extractor))
.Seal()
.Build();
// clang-format on
}
if (((name == "firstvalue" || name == "lastvalue") && argsCount == 1) ||
(name == "nthvalue" && argsCount == 2))
{
TString traitName;
if (name == "firstvalue") {
traitName = "first_value";
} else if (name == "lastvalue") {
traitName = "last_value";
} else if (name == "nthvalue") {
traitName = "nth_value";
} else {
YQL_ENSURE(false, "unexpected " << name);
}
TString path = "/lib/yql/window.yqls";
TString binding = traitName + "_traits_factory";
TExprNode::TPtr factory = ImportDeeplyCopied(
call->Pos(ctxExpr),
path, binding, ctxExpr, ctxTypes);
YQL_ENSURE(factory);
TExprNode::TPtr row = ctxExpr.NewArgument(call->Pos(), "row");
TExprNode::TPtr arg = argAt(0);
arg = rewrite(arg, row);
TExprNode::TPtr extractor = ctxExpr.NewLambda(
arg->Pos(), ctxExpr.NewArguments(call->Pos(), {row}), std::move(arg));
TExprNode::TPtr traits;
if (argsCount == 2) {
TExprNode::TPtr offset = argAt(1);
if (!isYql) {
// clang-format off
offset = ctxExpr.Builder(offset->Pos())
.Callable("FromPg")
.Add(0, std::move(offset))
.Seal()
.Build();
// clang-format on
}
// clang-format off
traits = ctxExpr.Builder(factory->Pos())
.Apply(std::move(factory))
.With(0, std::move(listType))
.With(1, std::move(extractor))
.With(2, std::move(offset))
.Seal()
.Build();
// clang-format on
} else {
// clang-format off
traits = ctxExpr.Builder(factory->Pos())
.Apply(std::move(factory))
.With(0, std::move(listType))
.With(1, std::move(extractor))
.Seal()
.Build();
// clang-format on
}
ctxExpr.Step.Repeat(TExprStep::ExpandApplyForLambdas);
auto status = ExpandApplyNoRepeat(traits, traits, ctxExpr);
YQL_ENSURE(status == IGraphTransformer::TStatus::Ok);
return traits;
}
ctxExpr.AddError(TIssue(
call->Pos(ctxExpr),
TStringBuilder()
<< "A window function " << name
<< "with " << argsCount << " arguments "
<< "is not yet supported"));
return nullptr;
}
} // namespace NYql
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