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#pragma once
#include <library/cpp/threading/future/core/future.h>
#include <util/generic/string.h>
#include <util/generic/vector.h>
#include <util/generic/hash_set.h>
#include <util/generic/maybe.h>
namespace NSQLComplete {
struct TFolderEntry {
static constexpr const char* Folder = "Folder";
static constexpr const char* Table = "Table";
static THashSet<TString> KnownTypes;
TString Type;
TString Name;
friend bool operator==(const TFolderEntry& lhs, const TFolderEntry& rhs) = default;
};
struct TListFilter {
TMaybe<THashSet<TString>> Types;
bool IsUnknownAllowed = false;
};
struct TListRequest {
TString Cluster;
// `Path` structure is defined by a `System`.
// Can end with a folder entry name hint.
// For example, `/local/exa` lists a folder `/local`,
// but can rank and filter entries by a hint `exa`.
TString Path;
TListFilter Filter;
size_t Limit = 128;
};
struct TListResponse {
size_t NameHintLength = 0;
TVector<TFolderEntry> Entries;
};
struct TDescribeTableRequest {
TString TableCluster;
TString TablePath;
TString ColumnPrefix;
size_t ColumnsLimit = 128; // TODO: introduce default limit constant
};
struct TDescribeTableResponse {
bool IsExisting = false;
TVector<TString> Columns;
};
class ISchema: public TThrRefBase {
public:
using TPtr = TIntrusivePtr<ISchema>;
virtual NThreading::TFuture<TListResponse> List(const TListRequest& request) const = 0;
virtual NThreading::TFuture<TDescribeTableResponse>
Describe(const TDescribeTableRequest& request) const = 0;
};
} // namespace NSQLComplete
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