ClickHouse/src/TableFunctions/TableFunctionHDFS.h

44 lines
971 B
C++

#pragma once
#include "config.h"
#if USE_HDFS
#include <TableFunctions/ITableFunctionFileLike.h>
namespace DB
{
class Context;
/* hdfs(URI, format[, structure, compression]) - creates a temporary storage from hdfs files
*
*/
class TableFunctionHDFS : public ITableFunctionFileLike
{
public:
static constexpr auto name = "hdfs";
std::string getName() const override
{
return name;
}
ColumnsDescription getActualTableStructure(ContextPtr context) const override;
std::unordered_set<String> getVirtualsToCheckBeforeUsingStructureHint() const override
{
return {"_path", "_file"};
}
private:
StoragePtr getStorage(
const String & source, const String & format_, const ColumnsDescription & columns, ContextPtr global_context,
const std::string & table_name, const String & compression_method_) const override;
const char * getStorageTypeName() const override { return "HDFS"; }
};
}
#endif