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#include "name_service.h"
#include <library/cpp/threading/future/wait/wait.h>
#include <library/cpp/iterator/iterate_values.h>
namespace NSQLComplete {
namespace {
class TNameService: public INameService {
public:
explicit TNameService(ISchema::TPtr schema)
: Schema_(std::move(schema))
{
}
NThreading::TFuture<TNameResponse> Lookup(const TNameRequest& request) const override {
if (request.Constraints.Object) {
return Schema_
->List(ToListRequest(request))
.Apply(ToListNameResponse);
}
if (request.Constraints.Column && !request.Constraints.Column->Tables.empty()) {
return BatchDescribe(
request.Constraints.Column->Tables,
request.Constraints.Column->WithoutByTableAlias,
request.Prefix,
request.Limit);
}
return NThreading::MakeFuture<TNameResponse>({});
}
private:
NThreading::TFuture<TNameResponse> BatchDescribe(
TVector<TAliased<TTableId>> tables,
THashMap<TString, THashSet<TString>> withoutByTableAlias,
TString prefix,
ui64 limit) const {
THashMap<TTableId, TVector<TString>> aliasesByTable;
for (TAliased<TTableId> table : std::move(tables)) {
aliasesByTable[std::move(static_cast<TTableId&>(table))]
.emplace_back(std::move(table.Alias));
}
THashMap<TTableId, NThreading::TFuture<TDescribeTableResponse>> futuresByTable;
for (const auto& [table, aliases] : aliasesByTable) {
TString columnPrefix = prefix;
for (const auto& alias : aliases) {
if (alias.StartsWith(prefix)) {
columnPrefix = "";
break;
}
}
TDescribeTableRequest request = {
.TableCluster = table.Cluster,
.TablePath = table.Path,
.ColumnPrefix = columnPrefix,
.ColumnsLimit = limit,
};
futuresByTable.emplace(table, Schema_->Describe(request));
}
auto futuresIt = IterateValues(futuresByTable);
TVector<NThreading::TFuture<TDescribeTableResponse>> futures(begin(futuresIt), end(futuresIt));
return NThreading::WaitAll(std::move(futures))
.Apply([aliasesByTable = std::move(aliasesByTable),
futuresByTable = std::move(futuresByTable),
withoutByTableAlias = std::move(withoutByTableAlias)](auto) mutable {
TNameResponse response;
for (auto [table, f] : futuresByTable) {
TDescribeTableResponse description = f.ExtractValue();
for (const TString& column : description.Columns) {
const auto& aliases = aliasesByTable[table];
for (const TString& alias : aliases) {
if ((withoutByTableAlias[alias].contains(column)) ||
(alias.empty() && 1 < aliases.size())) {
continue;
}
TColumnName name;
name.Identifier = column;
name.TableAlias = alias;
response.RankedNames.emplace_back(std::move(name));
}
}
}
return response;
});
}
static TListRequest ToListRequest(const TNameRequest& request) {
return {
.Cluster = ClusterName(*request.Constraints.Object),
.Path = request.Prefix,
.Filter = ToListFilter(request.Constraints),
.Limit = request.Limit,
};
}
static TString ClusterName(const TObjectNameConstraints& constraints) {
return constraints.Cluster;
}
static TListFilter ToListFilter(const TNameConstraints& constraints) {
const auto& kinds = constraints.Object->Kinds;
TListFilter filter;
filter.Types = THashSet<TString>();
filter.IsUnknownAllowed = kinds.contains(EObjectKind::Unknown);
for (EObjectKind kind : kinds) {
if (kind == EObjectKind::Unknown) {
continue;
}
filter.Types->emplace(ToFolderEntry(kind));
}
return filter;
}
static TString ToFolderEntry(EObjectKind kind) {
switch (kind) {
case EObjectKind::Folder:
return TFolderEntry::Folder;
case EObjectKind::Table:
return TFolderEntry::Table;
case EObjectKind::Unknown:
ythrow yexception()
<< "Unknown is a type class and "
<< "can not be a folder entry";
}
}
static TNameResponse ToListNameResponse(NThreading::TFuture<TListResponse> f) {
TListResponse list = f.ExtractValue();
TNameResponse response;
for (auto& entry : list.Entries) {
response.RankedNames.emplace_back(ToGenericName(std::move(entry)));
}
response.NameHintLength = list.NameHintLength;
return response;
}
static TGenericName ToGenericName(TFolderEntry entry) {
TGenericName name;
if (entry.Type == TFolderEntry::Folder) {
TFolderName local;
local.Identifier = std::move(entry.Name);
name = std::move(local);
} else if (entry.Type == TFolderEntry::Table) {
TTableName local;
local.Identifier = std::move(entry.Name);
name = std::move(local);
} else {
TUnknownName local;
local.Content = std::move(entry.Name);
local.Type = std::move(entry.Type);
name = std::move(local);
}
return name;
}
ISchema::TPtr Schema_;
};
} // namespace
INameService::TPtr MakeSchemaNameService(ISchema::TPtr schema) {
return new TNameService(std::move(schema));
}
} // namespace NSQLComplete
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