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MatchValidator.cpp
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/* Copyright (c) 2020 vesoft inc. All rights reserved.
*
* This source code is licensed under Apache 2.0 License.
*/
#include "graph/validator/MatchValidator.h"
#include "common/expression/FunctionCallExpression.h"
#include "common/expression/LogicalExpression.h"
#include "common/expression/MatchPathPatternExpression.h"
#include "common/expression/UnaryExpression.h"
#include "graph/planner/match/MatchSolver.h"
#include "graph/util/ExpressionUtils.h"
#include "graph/visitor/DeduceAliasTypeVisitor.h"
#include "graph/visitor/ExtractGroupSuiteVisitor.h"
#include "graph/visitor/RewriteVisitor.h"
#include "graph/visitor/ValidatePatternExpressionVisitor.h"
namespace nebula {
namespace graph {
MatchValidator::MatchValidator(Sentence *sentence, QueryContext *context)
: Validator(sentence, context) {
cypherCtx_ = getContext<CypherContext>();
}
AstContext *MatchValidator::getAstContext() {
return cypherCtx_.get();
}
Status MatchValidator::validateImpl() {
auto *sentence = static_cast<MatchSentence *>(sentence_);
auto &clauses = sentence->clauses();
std::unordered_map<std::string, AliasType> aliasesAvailable;
auto retClauseCtx = getContext<ReturnClauseContext>();
auto retYieldCtx = getContext<YieldClauseContext>();
retClauseCtx->yield = std::move(retYieldCtx);
cypherCtx_->queryParts.emplace_back();
for (auto &clause : clauses) {
auto kind = clause->kind();
switch (kind) {
case ReadingClause::Kind::kMatch: {
auto *matchClause = static_cast<MatchClause *>(clause.get());
auto matchClauseCtx = getContext<MatchClauseContext>();
matchClauseCtx->isOptional = matchClause->isOptional();
matchClauseCtx->aliasesAvailable = aliasesAvailable;
for (size_t j = 0; j < matchClause->path()->pathSize(); ++j) {
NG_RETURN_IF_ERROR(validatePath(matchClause->path()->path(j), *matchClauseCtx));
}
// Available aliases include the aliases pass from the with/unwind
// And previous aliases are all available to next match
auto aliasesTmp = matchClauseCtx->aliasesGenerated;
aliasesAvailable.merge(aliasesTmp);
// Copy the aliases without delete the origins.
aliasesTmp = matchClauseCtx->aliasesGenerated;
cypherCtx_->queryParts.back().aliasesGenerated.merge(aliasesTmp);
cypherCtx_->queryParts.back().matchs.emplace_back(std::move(matchClauseCtx));
if (matchClause->where() != nullptr) {
auto whereClauseCtx = getContext<WhereClauseContext>();
whereClauseCtx->aliasesAvailable = aliasesAvailable;
NG_RETURN_IF_ERROR(validateFilter(matchClause->where()->filter(), *whereClauseCtx));
cypherCtx_->queryParts.back().matchs.back()->where = std::move(whereClauseCtx);
}
break;
}
case ReadingClause::Kind::kUnwind: {
auto *unwindClause = static_cast<UnwindClause *>(clause.get());
auto unwindClauseCtx = getContext<UnwindClauseContext>();
unwindClauseCtx->aliasesAvailable = aliasesAvailable;
NG_RETURN_IF_ERROR(validateUnwind(unwindClause, *unwindClauseCtx));
// An unwind pass all available aliases.
aliasesAvailable.insert(unwindClauseCtx->aliasesGenerated.begin(),
unwindClauseCtx->aliasesGenerated.end());
cypherCtx_->queryParts.back().boundary = std::move(unwindClauseCtx);
cypherCtx_->queryParts.emplace_back();
cypherCtx_->queryParts.back().aliasesAvailable = aliasesAvailable;
break;
}
case ReadingClause::Kind::kWith: {
auto *withClause = static_cast<WithClause *>(clause.get());
auto withClauseCtx = getContext<WithClauseContext>();
auto withYieldCtx = getContext<YieldClauseContext>();
withClauseCtx->yield = std::move(withYieldCtx);
withClauseCtx->yield->aliasesAvailable = aliasesAvailable;
NG_RETURN_IF_ERROR(validateWith(withClause, cypherCtx_->queryParts, *withClauseCtx));
if (withClause->where() != nullptr) {
auto whereClauseCtx = getContext<WhereClauseContext>();
whereClauseCtx->aliasesAvailable = withClauseCtx->aliasesGenerated;
NG_RETURN_IF_ERROR(validateFilter(withClause->where()->filter(), *whereClauseCtx));
withClauseCtx->where = std::move(whereClauseCtx);
}
// A with pass all named aliases to the next query part.
if (withClause->returnItems()->allNamedAliases()) {
aliasesAvailable.insert(withClauseCtx->aliasesGenerated.begin(),
withClauseCtx->aliasesGenerated.end());
} else {
aliasesAvailable = withClauseCtx->aliasesGenerated;
}
cypherCtx_->queryParts.back().boundary = std::move(withClauseCtx);
cypherCtx_->queryParts.emplace_back();
cypherCtx_->queryParts.back().aliasesAvailable = aliasesAvailable;
break;
}
}
}
retClauseCtx->yield->aliasesAvailable = aliasesAvailable;
NG_RETURN_IF_ERROR(validateReturn(sentence->ret(), cypherCtx_->queryParts, *retClauseCtx));
NG_RETURN_IF_ERROR(buildOutputs(retClauseCtx->yield->yieldColumns));
cypherCtx_->queryParts.back().boundary = std::move(retClauseCtx);
return Status::OK();
}
// Validate match pattern
// \param path The pattern to be validated
// \param matchClauseCtx the context of current match clause
Status MatchValidator::validatePath(const MatchPath *path, MatchClauseContext &matchClauseCtx) {
matchClauseCtx.paths.emplace_back();
NG_RETURN_IF_ERROR(
buildNodeInfo(path, matchClauseCtx.paths.back().nodeInfos, matchClauseCtx.aliasesGenerated));
NG_RETURN_IF_ERROR(
buildEdgeInfo(path, matchClauseCtx.paths.back().edgeInfos, matchClauseCtx.aliasesGenerated));
NG_RETURN_IF_ERROR(
buildPathExpr(path, matchClauseCtx.paths.back(), matchClauseCtx.aliasesGenerated));
if (path->alias() == nullptr) {
auto &genPath = matchClauseCtx.paths.back().genPath;
genPath = false;
}
return Status::OK();
}
// Validate pattern from expression
Status MatchValidator::validatePath(const MatchPath *path, Path &pathInfo) {
// Pattern from expression won't generate new variable
std::unordered_map<std::string, AliasType> dummy;
NG_RETURN_IF_ERROR(buildNodeInfo(path, pathInfo.nodeInfos, dummy));
NG_RETURN_IF_ERROR(buildEdgeInfo(path, pathInfo.edgeInfos, dummy));
NG_RETURN_IF_ERROR(buildPathExpr(path, pathInfo, dummy));
pathInfo.isPred = path->isPredicate();
pathInfo.isAntiPred = path->isAntiPredicate();
return Status::OK();
}
// Build the path expression to collect data of match pattern.
Status MatchValidator::buildPathExpr(const MatchPath *path,
Path &pathInfo,
std::unordered_map<std::string, AliasType> &aliasesGenerated) {
auto &nodeInfos = pathInfo.nodeInfos;
auto &edgeInfos = pathInfo.edgeInfos;
auto pathType = path->pathType();
if (pathType != MatchPath::PathType::kDefault) {
if (nodeInfos.size() != 2 || edgeInfos.size() != 1) {
return Status::SemanticError(
"`shortestPath(...)' only support pattern like (start)-[edge*..hop]-(end)");
}
auto min = edgeInfos.front().range->min();
if (min != 0 && min != 1) {
return Status::SemanticError(
"`shortestPath(...)' does not support a minimal length different from 0 or 1");
}
pathInfo.pathType = static_cast<Path::PathType>(pathType);
}
auto *pathAlias = path->alias();
if (pathAlias != nullptr && !aliasesGenerated.emplace(*pathAlias, AliasType::kPath).second) {
return Status::SemanticError("`%s': Redefined alias", pathAlias->c_str());
}
auto *pool = qctx_->objPool();
auto pathBuild = PathBuildExpression::make(pool);
for (size_t i = 0; i < edgeInfos.size(); ++i) {
pathBuild->add(InputPropertyExpression::make(pool, nodeInfos[i].alias));
pathBuild->add(InputPropertyExpression::make(pool, edgeInfos[i].alias));
}
pathBuild->add(InputPropertyExpression::make(pool, nodeInfos.back().alias));
pathInfo.pathBuild = std::move(pathBuild);
pathInfo.anonymous = pathAlias == nullptr;
pathInfo.alias = pathAlias == nullptr ? path->toString() : *pathAlias;
return Status::OK();
}
// Build nodes information by match pattern.
Status MatchValidator::buildNodeInfo(const MatchPath *path,
std::vector<NodeInfo> &nodeInfos,
std::unordered_map<std::string, AliasType> &aliases) {
auto *sm = qctx_->schemaMng();
auto steps = path->steps();
auto *pool = qctx_->objPool();
nodeInfos.resize(steps + 1);
std::unordered_map<std::string, AliasType> nodeAliases;
for (auto i = 0u; i <= steps; i++) {
auto *node = path->node(i);
auto alias = node->alias();
auto *props = node->props();
auto anonymous = false;
// if there exists some property with no tag, return a semantic error
if (props != nullptr) {
return Status::SemanticError("`%s:%s': No tag found for property.",
props->items()[0].first.c_str(),
props->items()[0].second->toString().c_str());
}
if (node->labels() != nullptr) {
auto &labels = node->labels()->labels();
for (const auto &label : labels) {
if (label != nullptr) {
auto tid = sm->toTagID(space_.id, *label->label());
if (!tid.ok()) {
return Status::SemanticError("`%s': Unknown tag", label->label()->c_str());
}
nodeInfos[i].tids.emplace_back(tid.value());
nodeInfos[i].labels.emplace_back(*label->label());
nodeInfos[i].labelProps.emplace_back(label->props());
}
}
}
if (alias.empty()) {
anonymous = true;
alias = vctx_->anonVarGen()->getVar();
} else {
nodeAliases.emplace(alias, AliasType::kNode);
}
Expression *filter = nullptr;
/* Note(Xuntao): Commented out the following part. With the current parser,
if no tag is given in match clauses, node->props() is not nullptr but
node-labels() is. This is not supposed to be valid.
*/
/*
if (props != nullptr) {
auto result = makeNodeSubFilter(const_cast<MapExpression *>(props), "*");
NG_RETURN_IF_ERROR(result);
filter = result.value();
} else
*/
if (node->labels() != nullptr && !node->labels()->labels().empty()) {
const auto &labels = node->labels()->labels();
for (const auto &label : labels) {
auto result = makeNodeSubFilter(label->props(), *label->label());
NG_RETURN_IF_ERROR(result);
filter = andConnect(pool, filter, result.value());
}
}
nodeInfos[i].anonymous = anonymous;
nodeInfos[i].alias = alias;
nodeInfos[i].props = props;
nodeInfos[i].filter = filter;
}
aliases.merge(nodeAliases);
return Status::OK();
}
// Build edges information by match pattern.
Status MatchValidator::buildEdgeInfo(const MatchPath *path,
std::vector<EdgeInfo> &edgeInfos,
std::unordered_map<std::string, AliasType> &aliases) {
auto *sm = qctx_->schemaMng();
auto steps = path->steps();
edgeInfos.resize(steps);
for (auto i = 0u; i < steps; i++) {
auto *edge = path->edge(i);
auto &types = edge->types();
auto alias = edge->alias();
auto *props = edge->props();
auto direction = edge->direction();
auto anonymous = false;
if (!types.empty()) {
for (auto &type : types) {
auto etype = sm->toEdgeType(space_.id, *type);
if (!etype.ok()) {
return Status::SemanticError("`%s': Unknown edge type", type->c_str());
}
edgeInfos[i].edgeTypes.emplace_back(etype.value());
edgeInfos[i].types.emplace_back(*type);
}
} else {
const auto allEdgesResult = cypherCtx_->qctx->schemaMng()->getAllVerEdgeSchema(space_.id);
NG_RETURN_IF_ERROR(allEdgesResult);
const auto allEdges = std::move(allEdgesResult).value();
for (const auto &edgeSchema : allEdges) {
edgeInfos[i].edgeTypes.emplace_back(edgeSchema.first);
auto typeName = cypherCtx_->qctx->schemaMng()->toEdgeName(space_.id, edgeSchema.first);
NG_RETURN_IF_ERROR(typeName);
edgeInfos[i].types.emplace_back(typeName.value());
}
}
AliasType aliasType = AliasType::kEdge;
auto stepRange = const_cast<nebula::MatchEdge *>(edge)->range();
if (stepRange != nullptr) {
NG_RETURN_IF_ERROR(validateStepRange(stepRange));
// Type of [e*1..2], [e*2] should be inference to EdgeList
if (stepRange->max() > stepRange->min() || stepRange->min() > 1) {
aliasType = AliasType::kEdgeList;
}
edgeInfos[i].range.reset(new MatchStepRange(*stepRange));
}
if (alias.empty()) {
anonymous = true;
alias = vctx_->anonVarGen()->getVar();
} else {
if (!aliases.emplace(alias, aliasType).second) {
return Status::SemanticError("`%s': Redefined alias", alias.c_str());
}
}
Expression *filter = nullptr;
if (props != nullptr) {
auto result = makeEdgeSubFilter(const_cast<MapExpression *>(props));
NG_RETURN_IF_ERROR(result);
filter = result.value();
}
edgeInfos[i].anonymous = anonymous;
edgeInfos[i].direction = direction;
edgeInfos[i].alias = alias;
edgeInfos[i].props = props;
edgeInfos[i].filter = filter;
}
return Status::OK();
}
// Validate filter expression.
// Rewrite expression to fit semantic, check type and check used aliases.
Status MatchValidator::validateFilter(const Expression *filter,
WhereClauseContext &whereClauseCtx) {
auto undefinedParams = graph::ExpressionUtils::ExtractInnerVars(filter, qctx_);
if (!undefinedParams.empty()) {
return Status::SemanticError(
"Undefined parameters: " +
std::accumulate(++undefinedParams.begin(),
undefinedParams.end(),
*undefinedParams.begin(),
[](auto &lhs, auto &rhs) { return lhs + ", " + rhs; }));
}
auto *newFilter = graph::ExpressionUtils::rewriteParameter(filter, qctx_);
auto transformRes = ExpressionUtils::filterTransform(newFilter);
NG_RETURN_IF_ERROR(transformRes);
// rewrite Attribute to LabelTagProperty
newFilter = ExpressionUtils::rewriteAttr2LabelTagProp(transformRes.value(),
whereClauseCtx.aliasesAvailable);
newFilter = ExpressionUtils::rewriteEdgePropFunc2LabelAttribute(newFilter,
whereClauseCtx.aliasesAvailable);
whereClauseCtx.filter = newFilter;
auto typeStatus = deduceExprType(whereClauseCtx.filter);
NG_RETURN_IF_ERROR(typeStatus);
auto type = typeStatus.value();
// Allow implicit conversion from LIST to BOOL
if (type != Value::Type::BOOL && type != Value::Type::NULLVALUE &&
type != Value::Type::__EMPTY__ && type != Value::Type::LIST) {
std::stringstream ss;
ss << "`" << filter->toString() << "', expected Boolean, "
<< "but was `" << type << "'";
return Status::SemanticError(ss.str());
}
NG_RETURN_IF_ERROR(validateAliases({whereClauseCtx.filter}, whereClauseCtx.aliasesAvailable));
NG_RETURN_IF_ERROR(
validatePathInWhere(whereClauseCtx, whereClauseCtx.aliasesAvailable, whereClauseCtx.paths));
return Status::OK();
}
// Build columns according to symbols in match sentence.
Status MatchValidator::buildColumnsForAllNamedAliases(const std::vector<QueryPart> &queryParts,
YieldColumns *columns) const {
if (queryParts.empty()) {
return Status::Error("No alias declared.");
}
auto *pool = qctx_->objPool();
auto makeColumn = [&pool](const std::string &name) {
auto *expr = LabelExpression::make(pool, name);
return new YieldColumn(expr, name);
};
std::set<std::string> visitedAliases;
auto &currQueryPart = queryParts.back();
if (queryParts.size() > 1) {
auto &prevQueryPart = *(queryParts.end() - 2);
auto &boundary = prevQueryPart.boundary;
switch (boundary->kind) {
case CypherClauseKind::kUnwind: {
auto unwindCtx = static_cast<const UnwindClauseContext *>(boundary.get());
columns->addColumn(makeColumn(unwindCtx->alias), true);
for (auto &passAlias : prevQueryPart.aliasesAvailable) {
columns->addColumn(makeColumn(passAlias.first), true);
visitedAliases.emplace(passAlias.first);
}
for (auto &passAlias : prevQueryPart.aliasesGenerated) {
columns->addColumn(makeColumn(passAlias.first), true);
visitedAliases.emplace(passAlias.first);
}
break;
}
case CypherClauseKind::kWith: {
auto withCtx = static_cast<const WithClauseContext *>(boundary.get());
auto yieldColumns = withCtx->yield->yieldColumns;
if (yieldColumns == nullptr) {
break;
}
for (auto &col : yieldColumns->columns()) {
if (!col->alias().empty()) {
columns->addColumn(makeColumn(col->alias()), true);
visitedAliases.emplace(col->alias());
}
}
break;
}
default: {
DCHECK(false) << "Could not be a return or match.";
}
}
}
for (auto &match : currQueryPart.matchs) {
for (auto &path : match->paths) {
for (size_t i = 0; i < path.edgeInfos.size(); ++i) {
if (!path.nodeInfos[i].anonymous) {
if (visitedAliases.find(path.nodeInfos[i].alias) == visitedAliases.end()) {
columns->addColumn(makeColumn(path.nodeInfos[i].alias));
visitedAliases.emplace(path.nodeInfos[i].alias);
}
}
if (!path.edgeInfos[i].anonymous) {
if (visitedAliases.find(path.edgeInfos[i].alias) == visitedAliases.end()) {
columns->addColumn(makeColumn(path.edgeInfos[i].alias));
visitedAliases.emplace(path.edgeInfos[i].alias);
}
}
}
if (!path.nodeInfos.back().anonymous) {
if (visitedAliases.find(path.nodeInfos.back().alias) == visitedAliases.end()) {
columns->addColumn(makeColumn(path.nodeInfos.back().alias));
visitedAliases.emplace(path.nodeInfos.back().alias);
}
}
}
for (auto &aliasPair : match->aliasesGenerated) {
if (aliasPair.second == AliasType::kPath) {
columns->addColumn(makeColumn(aliasPair.first));
}
}
}
return Status::OK();
}
// Check validity of return clause.
// Disable return * without symbols, disable invalid expressions, check aggregate expression,
// rewrite expression to fit semantic, check available aliases, check columns, check limit and
// order by options.
Status MatchValidator::validateReturn(MatchReturn *ret,
const std::vector<QueryPart> &queryParts,
ReturnClauseContext &retClauseCtx) {
YieldColumns *columns = retClauseCtx.qctx->objPool()->makeAndAdd<YieldColumns>();
if (ret->returnItems()->allNamedAliases() && !queryParts.empty()) {
auto status = buildColumnsForAllNamedAliases(queryParts, columns);
if (!status.ok()) {
return status;
}
if (columns->empty() && !ret->returnItems()->columns()) {
return Status::SemanticError("RETURN * is not allowed when there are no variables in scope");
}
}
std::vector<const Expression *> exprs;
if (ret->returnItems()->columns()) {
exprs.reserve(ret->returnItems()->columns()->size());
for (auto *column : ret->returnItems()->columns()->columns()) {
if (ExpressionUtils::hasAny(column->expr(),
{Expression::Kind::kVertex, Expression::Kind::kEdge})) {
return Status::SemanticError(
"keywords: vertex and edge are not supported in return clause `%s'",
column->toString().c_str());
}
if (!retClauseCtx.yield->hasAgg_ &&
ExpressionUtils::hasAny(column->expr(), {Expression::Kind::kAggregate})) {
retClauseCtx.yield->hasAgg_ = true;
}
column->setExpr(ExpressionUtils::rewriteAttr2LabelTagProp(
column->expr(), retClauseCtx.yield->aliasesAvailable));
exprs.push_back(column->expr());
columns->addColumn(column->clone().release());
}
}
DCHECK(!columns->empty());
retClauseCtx.yield->yieldColumns = columns;
NG_RETURN_IF_ERROR(validateAliases(exprs, retClauseCtx.yield->aliasesAvailable));
NG_RETURN_IF_ERROR(validateYield(*retClauseCtx.yield));
retClauseCtx.yield->distinct = ret->isDistinct();
auto paginationCtx = getContext<PaginationContext>();
NG_RETURN_IF_ERROR(validatePagination(ret->skip(), ret->limit(), *paginationCtx));
retClauseCtx.pagination = std::move(paginationCtx);
if (ret->orderFactors() != nullptr) {
auto orderByCtx = getContext<OrderByClauseContext>();
NG_RETURN_IF_ERROR(
validateOrderBy(ret->orderFactors(), retClauseCtx.yield->yieldColumns, *orderByCtx));
retClauseCtx.order = std::move(orderByCtx);
}
return Status::OK();
}
// Validate does aliases in expression available.
Status MatchValidator::validateAliases(
const std::vector<const Expression *> &exprs,
const std::unordered_map<std::string, AliasType> &aliasesAvailable) const {
static const std::unordered_set<Expression::Kind> kinds = {
Expression::Kind::kLabel,
Expression::Kind::kLabelAttribute,
Expression::Kind::kLabelTagProperty,
// primitive props
Expression::Kind::kEdgeSrc,
Expression::Kind::kEdgeDst,
Expression::Kind::kEdgeRank,
Expression::Kind::kEdgeType,
// invalid prop exprs
Expression::Kind::kSrcProperty,
Expression::Kind::kDstProperty,
};
for (auto *expr : exprs) {
auto refExprs = ExpressionUtils::collectAll(expr, kinds);
if (refExprs.empty()) {
continue;
}
for (auto *refExpr : refExprs) {
NG_RETURN_IF_ERROR(checkAlias(refExpr, aliasesAvailable));
}
}
return Status::OK();
}
// Check validity of step number. e.g. match (v)-[e*2..3]->()
Status MatchValidator::validateStepRange(const MatchStepRange *range) const {
auto min = range->min();
auto max = range->max();
if (min > max) {
return Status::SemanticError(
"Max hop must be greater equal than min hop: %ld vs. %ld", max, min);
}
return Status::OK();
}
// Check validity of with clause.
// Build output columns, rewrite expression to fit semantic, check available aliases,
// check aggregate expression, check columns, check limit and order by options.
Status MatchValidator::validateWith(const WithClause *with,
const std::vector<QueryPart> &queryParts,
WithClauseContext &withClauseCtx) {
YieldColumns *columns = withClauseCtx.qctx->objPool()->makeAndAdd<YieldColumns>();
if (with->returnItems()->allNamedAliases() && !queryParts.empty()) {
auto status = buildColumnsForAllNamedAliases(queryParts, columns);
if (!status.ok()) {
return status;
}
}
if (with->returnItems()->columns()) {
for (auto *column : with->returnItems()->columns()->columns()) {
column->setExpr(ExpressionUtils::rewriteAttr2LabelTagProp(
column->expr(), withClauseCtx.yield->aliasesAvailable));
columns->addColumn(column->clone().release());
}
}
withClauseCtx.yield->yieldColumns = columns;
// Check all referencing expressions are valid
std::vector<const Expression *> exprs;
exprs.reserve(withClauseCtx.yield->yieldColumns->size());
for (auto *col : withClauseCtx.yield->yieldColumns->columns()) {
auto labelExprs = ExpressionUtils::collectAll(col->expr(), {Expression::Kind::kLabel});
auto aliasType = AliasType::kRuntime;
for (auto *labelExpr : labelExprs) {
auto label = static_cast<const LabelExpression *>(labelExpr)->name();
if (!withClauseCtx.yield->aliasesAvailable.count(label)) {
return Status::SemanticError("Alias `%s` not defined", label.c_str());
}
AliasType inputType = withClauseCtx.yield->aliasesAvailable.at(label);
DeduceAliasTypeVisitor visitor(qctx_, vctx_, space_.id, inputType);
const_cast<Expression *>(col->expr())->accept(&visitor);
if (!visitor.ok()) {
return std::move(visitor).status();
}
aliasType = visitor.outputType();
}
if (col->alias().empty()) {
if (col->expr()->kind() == Expression::Kind::kLabel) {
col->setAlias(col->toString());
} else {
return Status::SemanticError("Expression in WITH must be aliased (use AS)");
}
}
if (col->expr()->kind() == Expression::Kind::kLabel) {
auto label = static_cast<const LabelExpression *>(col->expr())->name();
auto found = withClauseCtx.yield->aliasesAvailable.find(label);
DCHECK(found != withClauseCtx.yield->aliasesAvailable.end());
if (!withClauseCtx.aliasesGenerated.emplace(col->alias(), found->second).second) {
auto columnFound = withClauseCtx.yield->yieldColumns->find(col->alias());
if (!(columnFound != nullptr && columnFound->isMatched())) {
return Status::SemanticError("`%s': Redefined alias", col->alias().c_str());
}
}
} else {
if (!withClauseCtx.aliasesGenerated.emplace(col->alias(), aliasType).second) {
return Status::SemanticError("`%s': Redefined alias", col->alias().c_str());
}
}
if (!withClauseCtx.yield->hasAgg_ &&
ExpressionUtils::hasAny(col->expr(), {Expression::Kind::kAggregate})) {
withClauseCtx.yield->hasAgg_ = true;
}
exprs.push_back(col->expr());
}
NG_RETURN_IF_ERROR(validateAliases(exprs, withClauseCtx.yield->aliasesAvailable));
NG_RETURN_IF_ERROR(validateYield(*withClauseCtx.yield));
withClauseCtx.yield->distinct = with->isDistinct();
auto paginationCtx = getContext<PaginationContext>();
NG_RETURN_IF_ERROR(validatePagination(with->skip(), with->limit(), *paginationCtx));
withClauseCtx.pagination = std::move(paginationCtx);
if (with->orderFactors() != nullptr) {
auto orderByCtx = getContext<OrderByClauseContext>();
NG_RETURN_IF_ERROR(
validateOrderBy(with->orderFactors(), withClauseCtx.yield->yieldColumns, *orderByCtx));
withClauseCtx.order = std::move(orderByCtx);
}
return Status::OK();
}
// Check validity of unwind clause.
// Check column must has alias, check can't contains aggregate expression, check alias in
// expression must be available, check defined alias don't defined before.
Status MatchValidator::validateUnwind(const UnwindClause *unwindClause,
UnwindClauseContext &unwindCtx) {
if (unwindClause->alias().empty()) {
return Status::SemanticError("Expression in UNWIND must be aliased (use AS)");
}
unwindCtx.alias = unwindClause->alias();
unwindCtx.unwindExpr = ExpressionUtils::rewriteAttr2LabelTagProp(unwindClause->expr()->clone(),
unwindCtx.aliasesAvailable);
if (ExpressionUtils::hasAny(unwindCtx.unwindExpr, {Expression::Kind::kAggregate})) {
return Status::SemanticError("Can't use aggregating expressions in unwind clause, `%s'",
unwindCtx.unwindExpr->toString().c_str());
}
auto labelExprs = ExpressionUtils::collectAll(unwindCtx.unwindExpr, {Expression::Kind::kLabel});
std::vector<AliasType> types;
for (auto *labelExpr : labelExprs) {
DCHECK_EQ(labelExpr->kind(), Expression::Kind::kLabel);
auto label = static_cast<const LabelExpression *>(labelExpr)->name();
auto it = unwindCtx.aliasesAvailable.find(label);
if (it == unwindCtx.aliasesAvailable.end()) {
return Status::SemanticError("Variable `%s` not defined", label.c_str());
}
types.push_back(it->second);
}
// UNWIND Type Inference:
// Example: UNWIND x,y AS z
// if x,y have same type
// set z to the same type
// else
// set z to default
AliasType aliasType = AliasType::kRuntime;
if (types.size() > 0 &&
std::adjacent_find(types.begin(), types.end(), std::not_equal_to<>()) == types.end()) {
aliasType = types[0];
}
unwindCtx.aliasesGenerated.emplace(unwindCtx.alias, aliasType);
if (unwindCtx.aliasesAvailable.count(unwindCtx.alias) > 0) {
return Status::SemanticError("Variable `%s` already declared", unwindCtx.alias.c_str());
}
NG_RETURN_IF_ERROR(
validateMatchPathExpr(unwindCtx.unwindExpr, unwindCtx.aliasesAvailable, unwindCtx.paths));
return Status::OK();
}
// Convert map attributes of edge defined in pattern to filter expression and keep origin semantic.
// e.g. convert match ()-[e{a:1, b:2}]->() to *.a == 1 && *.b == 2
StatusOr<Expression *> MatchValidator::makeEdgeSubFilter(MapExpression *map) const {
auto *pool = qctx_->objPool();
DCHECK(map != nullptr);
auto &items = map->items();
DCHECK(!items.empty());
auto foldStatus = ExpressionUtils::foldConstantExpr(items[0].second);
NG_RETURN_IF_ERROR(foldStatus);
auto foldExpr = foldStatus.value();
if (!ExpressionUtils::isEvaluableExpr(foldExpr, qctx_)) {
return Status::SemanticError("Props must be evaluable: `%s'",
items[0].second->toString().c_str());
}
map->setItem(0, std::make_pair(items[0].first, foldExpr));
Expression *root = RelationalExpression::makeEQ(
pool, EdgePropertyExpression::make(pool, "*", items[0].first), foldExpr);
for (auto i = 1u; i < items.size(); i++) {
foldStatus = ExpressionUtils::foldConstantExpr(items[i].second);
NG_RETURN_IF_ERROR(foldStatus);
foldExpr = foldStatus.value();
if (!ExpressionUtils::isEvaluableExpr(foldExpr, qctx_)) {
return Status::SemanticError("Props must be evaluable: `%s'",
items[i].second->toString().c_str());
}
map->setItem(0, std::make_pair(items[i].first, foldExpr));
auto *left = root;
auto *right = RelationalExpression::makeEQ(
pool, EdgePropertyExpression::make(pool, "*", items[i].first), foldExpr);
root = LogicalExpression::makeAnd(pool, left, right);
}
return root;
}
// Convert map attributes of vertex defined in pattern to filter expression and keep origin semantic
// e.g. convert match (v{a:1, b:2}) to v.a == 1 && v.b == 2
StatusOr<Expression *> MatchValidator::makeNodeSubFilter(MapExpression *map,
const std::string &label) const {
auto *pool = qctx_->objPool();
// Node has tag without property
if (!label.empty() && map == nullptr) {
// label._tag IS NOT EMPTY
auto *tagExpr = TagPropertyExpression::make(pool, label, kTag);
auto *root = UnaryExpression::makeIsNotEmpty(pool, tagExpr);
return root;
}
DCHECK(map != nullptr);
auto &items = map->items();
DCHECK(!items.empty());
auto foldStatus = ExpressionUtils::foldConstantExpr(items[0].second);
NG_RETURN_IF_ERROR(foldStatus);
auto foldExpr = foldStatus.value();
if (!ExpressionUtils::isEvaluableExpr(foldExpr, qctx_)) {
return Status::SemanticError("Props must be evaluable: `%s'",
items[0].second->toString().c_str());
}
map->setItem(0, std::make_pair(items[0].first, foldExpr));
Expression *root = RelationalExpression::makeEQ(
pool, TagPropertyExpression::make(pool, label, items[0].first), foldExpr);
for (auto i = 1u; i < items.size(); i++) {
foldStatus = ExpressionUtils::foldConstantExpr(items[i].second);
NG_RETURN_IF_ERROR(foldStatus);
foldExpr = foldStatus.value();
if (!ExpressionUtils::isEvaluableExpr(foldExpr, qctx_)) {
return Status::SemanticError("Props must be evaluable: `%s'",
items[i].second->toString().c_str());
}
map->setItem(i, std::make_pair(items[i].first, foldExpr));
auto *left = root;
auto *right = RelationalExpression::makeEQ(
pool, TagPropertyExpression::make(pool, label, items[i].first), foldExpr);
root = LogicalExpression::makeAnd(pool, left, right);
}
return root;
}
// Connect two expression by AND operator.
/*static*/ Expression *MatchValidator::andConnect(ObjectPool *pool,
Expression *left,
Expression *right) {
if (left == nullptr) {
return right;
}
if (right == nullptr) {
return left;
}
return LogicalExpression::makeAnd(pool, left, right);
}
// Combine two set of aliases (current and successor), and disable redefined aliases.
Status MatchValidator::combineAliases(
std::unordered_map<std::string, AliasType> &curAliases,
const std::unordered_map<std::string, AliasType> &lastAliases) const {
for (auto &aliasPair : lastAliases) {
if (!curAliases.emplace(aliasPair).second) {
return Status::SemanticError("`%s': Redefined alias", aliasPair.first.c_str());
}
}
return Status::OK();
}
// Check validity of skip/limit numbers.
Status MatchValidator::validatePagination(const Expression *skipExpr,
const Expression *limitExpr,
PaginationContext &paginationCtx) const {
int64_t skip = 0;
int64_t limit = std::numeric_limits<int64_t>::max();
if (skipExpr != nullptr) {
if (!ExpressionUtils::isEvaluableExpr(skipExpr, qctx_)) {
return Status::SemanticError("SKIP should be instantly evaluable");
}
auto value = const_cast<Expression *>(skipExpr)->eval(QueryExpressionContext(qctx_->ectx())());
if (!value.isInt()) {
return Status::SemanticError("SKIP should be of type integer");
}
if (value.getInt() < 0) {
return Status::SemanticError("SKIP should not be negative");
}
skip = value.getInt();
}
if (limitExpr != nullptr) {
if (!ExpressionUtils::isEvaluableExpr(limitExpr, qctx_)) {
return Status::SemanticError("SKIP should be instantly evaluable");
}
auto value = const_cast<Expression *>(limitExpr)->eval(QueryExpressionContext(qctx_->ectx())());
if (!value.isInt()) {
return Status::SemanticError("LIMIT should be of type integer");
}
if (value.getInt() < 0) {
return Status::SemanticError("LIMIT should not be negative");
}
limit = value.getInt();
}
paginationCtx.skip = skip;
paginationCtx.limit = limit;
return Status::OK();
}
// Check validity of order by options.
// Disable duplicate columns,
// check expression of column (only constant expression and label expression)
Status MatchValidator::validateOrderBy(const OrderFactors *factors,
const YieldColumns *yieldColumns,
OrderByClauseContext &orderByCtx) const {
if (factors != nullptr) {
std::vector<std::string> inputColList;
inputColList.reserve(yieldColumns->columns().size());
for (auto *col : yieldColumns->columns()) {
inputColList.emplace_back(col->name());
}
std::unordered_map<std::string, size_t> inputColIndices;
for (auto i = 0u; i < inputColList.size(); i++) {
if (!inputColIndices.emplace(inputColList[i], i).second) {
return Status::SemanticError("Duplicated columns not allowed: %s", inputColList[i].c_str());
}
}
for (auto &factor : factors->factors()) {
auto factorExpr = factor->expr();
if (ExpressionUtils::isEvaluableExpr(factorExpr, qctx_)) continue;
if (factorExpr->kind() != Expression::Kind::kLabel) {
return Status::SemanticError("Only column name can be used as sort item");
}
auto &name = static_cast<const LabelExpression *>(factor->expr())->name();
auto iter = inputColIndices.find(name);
if (iter == inputColIndices.end()) {
return Status::SemanticError("Column `%s' not found", name.c_str());
}
orderByCtx.indexedOrderFactors.emplace_back(iter->second, factor->orderType());
}
}
return Status::OK();
}
// Validate group by and fill group by context.
Status MatchValidator::validateGroup(YieldClauseContext &yieldCtx) {
auto cols = yieldCtx.yieldColumns->columns();
auto *pool = qctx_->objPool();
DCHECK(!cols.empty());
for (auto *col : cols) {
auto *colExpr = col->expr();
NG_RETURN_IF_ERROR(validateMatchPathExpr(colExpr, yieldCtx.aliasesAvailable, yieldCtx.paths));
auto colOldName = col->name();
if (colExpr->kind() != Expression::Kind::kAggregate &&
ExpressionUtils::hasAny(colExpr, {Expression::Kind::kAggregate})) {
ExtractGroupSuiteVisitor visitor(qctx_);
colExpr->accept(&visitor);
GroupSuite groupSuite = visitor.groupSuite();
yieldCtx.groupKeys_.insert(
yieldCtx.groupKeys_.end(), groupSuite.groupKeys.begin(), groupSuite.groupKeys.end());
for (auto *item : groupSuite.groupItems) {
if (item->kind() == Expression::Kind::kAggregate) {
NG_RETURN_IF_ERROR(
ExpressionUtils::checkAggExpr(static_cast<const AggregateExpression *>(item)));
}
yieldCtx.groupItems_.emplace_back(item);
yieldCtx.needGenProject_ = true;
yieldCtx.aggOutputColumnNames_.emplace_back(item->toString());
}
if (!groupSuite.groupItems.empty()) {
auto *rewritedExpr =
ExpressionUtils::rewriteSubExprs2VarProp(colExpr->clone(), groupSuite.groupItems);
yieldCtx.projCols_->addColumn(new YieldColumn(rewritedExpr, colOldName));
yieldCtx.projOutputColumnNames_.emplace_back(colOldName);
continue;
}
}
if (colExpr->kind() == Expression::Kind::kAggregate) {
auto *aggExpr = static_cast<AggregateExpression *>(colExpr);
NG_RETURN_IF_ERROR(ExpressionUtils::checkAggExpr(aggExpr));
} else if (!ExpressionUtils::isEvaluableExpr(colExpr, qctx_)) {
yieldCtx.groupKeys_.emplace_back(colExpr);
}
yieldCtx.groupItems_.emplace_back(colExpr);
yieldCtx.projCols_->addColumn(
new YieldColumn(VariablePropertyExpression::make(pool, "", colOldName), colOldName));
yieldCtx.projOutputColumnNames_.emplace_back(colOldName);
yieldCtx.aggOutputColumnNames_.emplace_back(colOldName);
}
return Status::OK();
}
// Validate yield clause, check normal yield and group by yield.
Status MatchValidator::validateYield(YieldClauseContext &yieldCtx) {
auto cols = yieldCtx.yieldColumns->columns();
if (cols.empty()) {
return Status::OK();
}
yieldCtx.projCols_ = yieldCtx.qctx->objPool()->makeAndAdd<YieldColumns>();
if (!yieldCtx.hasAgg_) {
for (auto &col : yieldCtx.yieldColumns->columns()) {
NG_RETURN_IF_ERROR(
validateMatchPathExpr(col->expr(), yieldCtx.aliasesAvailable, yieldCtx.paths));
yieldCtx.projCols_->addColumn(col->clone().release());
yieldCtx.projOutputColumnNames_.emplace_back(col->name());
}
return Status::OK();
} else {
return validateGroup(yieldCtx);
}
}
// Check is alias available and get type of alias.
StatusOr<AliasType> MatchValidator::getAliasType(
const std::unordered_map<std::string, AliasType> &aliasesAvailable,
const std::string &name) const {
auto iter = aliasesAvailable.find(name);
if (iter == aliasesAvailable.end()) {
return Status::SemanticError("Alias used but not defined: `%s'", name.c_str());
}
return iter->second;
}
// Check is aliases used in expression available(defined).
Status MatchValidator::checkAlias(
const Expression *refExpr,
const std::unordered_map<std::string, AliasType> &aliasesAvailable) const {
auto kind = refExpr->kind();
AliasType aliasType = AliasType::kRuntime;
switch (kind) {
case Expression::Kind::kLabel: {
auto name = static_cast<const LabelExpression *>(refExpr)->name();
auto res = getAliasType(aliasesAvailable, name);
NG_RETURN_IF_ERROR(res);
return Status::OK();
}
case Expression::Kind::kLabelTagProperty: {
auto labelExpr = static_cast<const LabelTagPropertyExpression *>(refExpr)->label();
auto name = static_cast<const VariablePropertyExpression *>(labelExpr)->prop();
auto res = getAliasType(aliasesAvailable, name);
NG_RETURN_IF_ERROR(res);
if (res.value() == AliasType::kEdge || res.value() == AliasType::kPath) {
return Status::SemanticError("The type of `%s' should be tag", name.c_str());
}
return Status::OK();
}
case Expression::Kind::kLabelAttribute: {
auto name = static_cast<const LabelAttributeExpression *>(refExpr)->left()->name();
auto res = getAliasType(aliasesAvailable, name);
NG_RETURN_IF_ERROR(res);
return Status::OK();
}
case Expression::Kind::kEdgeSrc: {