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#include "yql_opt_match_recognize.h"
#include "yql_opt_utils.h"
#include <yql/essentials/core/sql_types/time_order_recover.h>
#include <yql/essentials/core/yql_expr_optimize.h>
#include <yql/essentials/utils/log/log.h>
namespace NYql {
using namespace NNodes;
namespace {
bool IsStreaming(const TExprNode::TPtr& input, const TTypeAnnotationContext& typeAnnCtx) {
if (EMatchRecognizeStreamingMode::Disable == typeAnnCtx.MatchRecognizeStreaming){
return false;
}
if (EMatchRecognizeStreamingMode::Force == typeAnnCtx.MatchRecognizeStreaming){
return true;
}
YQL_ENSURE(EMatchRecognizeStreamingMode::Auto == typeAnnCtx.MatchRecognizeStreaming, "Internal logic error");
bool hasPq = false;
NYql::VisitExpr(input, [&hasPq](const TExprNode::TPtr& node){
if (node->IsCallable("DataSource")) {
YQL_ENSURE(node->ChildrenSize() > 0 and node->ChildRef(0)->IsAtom());
hasPq = node->ChildRef(0)->Content() == "pq";
}
return !hasPq;
});
return hasPq;
}
} //namespace
// returns std::nullopt if all vars could be used
std::optional<TSet<TStringBuf>> FindUsedVars(const TExprNode::TPtr& params) {
TSet<TStringBuf> usedVars;
bool allVarsUsed = false;
const auto createVisitor = [&usedVars, &allVarsUsed](const TExprNode::TPtr& varsArg) {
return [&varsArg, &usedVars, &allVarsUsed](const TExprNode::TPtr& node) -> bool {
if (node->IsCallable("Member")) {
if (node->ChildRef(0) == varsArg) {
usedVars.insert(node->ChildRef(1)->Content());
return false;
}
}
if (node == varsArg) {
allVarsUsed = true;
}
return true;
};
};
const auto& measures = params->ChildRef(0);
static constexpr size_t measureLambdasStartPos = 3;
for (size_t pos = measureLambdasStartPos; pos != measures->ChildrenSize(); pos++) {
const auto& lambda = measures->ChildRef(pos);
const auto& lambdaArgs = lambda->ChildRef(0);
const auto& lambdaBody = lambda->ChildRef(1);
const auto& varsArg = lambdaArgs->ChildRef(1);
NYql::VisitExpr(lambdaBody, createVisitor(varsArg));
}
const auto& defines = params->ChildRef(4);
static constexpr size_t defineLambdasStartPos = 3;
for (size_t pos = defineLambdasStartPos; pos != defines->ChildrenSize(); pos++) {
const auto& lambda = defines->ChildRef(pos);
const auto& lambdaArgs = lambda->ChildRef(0);
const auto& lambdaBody = lambda->ChildRef(1);
const auto& varsArg = lambdaArgs->ChildRef(1);
NYql::VisitExpr(lambdaBody, createVisitor(varsArg));
}
return allVarsUsed ? std::nullopt : std::make_optional(usedVars);
}
// usedVars can be std::nullopt if all vars could probably be used
TExprNode::TPtr MarkUnusedPatternVars(const TExprNode::TPtr& node, TExprContext& ctx, const std::optional<TSet<TStringBuf>> &usedVars) {
const auto pos = node->Pos();
if (node->ChildrenSize() != 0 && node->ChildRef(0)->IsAtom()) {
const auto& varName = node->ChildRef(0)->Content();
bool varUsed = !usedVars.has_value() || usedVars.value().contains(varName);
return ctx.Builder(pos)
.List()
.Add(0, node->ChildRef(0))
.Add(1, node->ChildRef(1))
.Add(2, node->ChildRef(2))
.Add(3, node->ChildRef(3))
.Add(4, node->ChildRef(4))
.Add(5, ctx.NewAtom(pos, varUsed ? "0" : "1"))
.Seal()
.Build();
}
TExprNodeList newChildren;
for (size_t chPos = 0; chPos != node->ChildrenSize(); chPos++) {
newChildren.push_back(MarkUnusedPatternVars(node->ChildRef(chPos), ctx, usedVars));
}
if (node->IsCallable()) {
return ctx.Builder(pos).Callable(node->Content()).Add(std::move(newChildren)).Seal().Build();
} else if (node->IsList()) {
return ctx.Builder(pos).List().Add(std::move(newChildren)).Seal().Build();
} else { // Atom
return node;
}
}
TExprNode::TPtr ExpandMatchRecognize(const TExprNode::TPtr& node, TExprContext& ctx, TTypeAnnotationContext& typeAnnCtx) {
YQL_ENSURE(node->IsCallable({"MatchRecognize"}));
const auto& input = node->ChildRef(0);
const auto& partitionKeySelector = node->ChildRef(1);
const auto& partitionColumns = node->ChildRef(2);
const auto& sortTraits = node->ChildRef(3);
const auto& params = node->ChildRef(4);
const auto pos = node->Pos();
const bool isStreaming = IsStreaming(input, typeAnnCtx);
TExprNode::TPtr settings = AddSetting(*ctx.NewList(pos, {}), pos,
"Streaming", ctx.NewAtom(pos, ToString(isStreaming)), ctx);
const auto matchRecognize = ctx.Builder(pos)
.Lambda()
.Param("sortedPartition")
.Callable(0, "ForwardList")
.Callable(0, "MatchRecognizeCore")
.Callable(0, "ToFlow")
.Arg(0, "sortedPartition")
.Seal()
.Add(1, partitionKeySelector)
.Add(2, partitionColumns)
.Callable(3, params->Content())
.Add(0, params->ChildRef(0))
.Add(1, params->ChildRef(1))
.Add(2, params->ChildRef(2))
.Add(3, MarkUnusedPatternVars(params->ChildRef(3), ctx, FindUsedVars(params)))
.Add(4, params->ChildRef(4))
.Seal()
.Add(4, settings)
.Seal()
.Seal()
.Seal()
.Build();
TExprNode::TPtr sortKey;
TExprNode::TPtr sortOrder;
ExtractSortKeyAndOrder(pos, sortTraits, sortKey, sortOrder, ctx);
TExprNode::TPtr result;
if (isStreaming) {
YQL_ENSURE(sortOrder->ChildrenSize() == 1, "Expect ORDER BY timestamp for MATCH_RECOGNIZE");
const auto reordered = ctx.Builder(pos)
.Lambda()
.Param("partition")
.Callable("ForwardList")
.Callable(0, "OrderedMap")
.Callable(0, "TimeOrderRecover")
.Callable(0, "ToFlow").
Arg(0, "partition")
.Seal()
.Add(1, sortKey)
.Callable(2, "Interval")
.Add(0, ctx.NewAtom(pos, ToString(typeAnnCtx.TimeOrderRecoverDelay)))
.Seal()
.Callable(3, "Interval")
.Add(0, ctx.NewAtom(pos, ToString(typeAnnCtx.TimeOrderRecoverAhead)))
.Seal()
.Callable(4, "Uint32")
.Add(0, ctx.NewAtom(pos, ToString(typeAnnCtx.TimeOrderRecoverRowLimit)))
.Seal()
.Seal()
.Lambda(1)
.Param("row")
.Callable("RemoveMember")
.Arg(0, "row")
.Add(1, ctx.NewAtom(pos, NYql::NTimeOrderRecover::OUT_OF_ORDER_MARKER))
.Seal()
.Seal()
.Seal()
.Seal()
.Seal()
.Build();
const auto matchRecognizeOnReorderedPartition = ctx.Builder(pos)
.Lambda()
.Param("partition")
.Apply(matchRecognize)
.With(0)
.Apply(reordered)
.With(0)
.Arg("partition")
.Done()
.Seal()
.Done()
.Seal()
.Seal()
.Build();
TExprNode::TPtr keySelector;
if (partitionColumns->ChildrenSize() != 0) {
keySelector = partitionKeySelector;
} else {
//Use pseudo partitioning with constant lambda to wrap TimeOrderRecover into DQ stage
//TODO(zverevgeny): fixme
keySelector = ctx.Builder(pos)
.Lambda()
.Param("row")
.Callable("Bool")
.Add(0, ctx.NewAtom(pos, "true"))
.Seal()
.Seal()
.Build();
}
result = ctx.Builder(pos)
.Callable("ShuffleByKeys")
.Add(0, input)
.Add(1, keySelector)
.Add(2, matchRecognizeOnReorderedPartition)
.Seal()
.Build();
} else { //non-streaming
result = ctx.Builder(pos)
.Callable("PartitionsByKeys")
.Add(0, input)
.Add(1, partitionKeySelector)
.Add(2, sortOrder)
.Add(3, sortKey)
.Add(4, matchRecognize)
.Seal()
.Build();
}
YQL_CLOG(INFO, Core) << "Expanded MatchRecognize";
return result;
}
} //namespace NYql
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