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#pragma once
#include <TableFunctions/ITableFunctionFileLike.h>
namespace DB
{
/* file(path, format[, structure, compression]) - creates a temporary storage from file
*
* The file must be in the clickhouse data directory.
* The relative path begins with the clickhouse data directory.
*/
class TableFunctionFile : public ITableFunctionFileLike
{
public:
static constexpr auto name = "file";
std::string getName() const override
{
return name;
}
ColumnsDescription getActualTableStructure(ContextPtr context, bool is_insert_query) const override;
std::unordered_set<String> getVirtualsToCheckBeforeUsingStructureHint() const override
{
return {"_path", "_file"};
}
protected:
int fd = -1;
void parseFirstArguments(const ASTPtr & arg, const ContextPtr & context) override;
String getFormatFromFirstArgument() override;
private:
StoragePtr getStorage(
const String & source, const String & format_, const ColumnsDescription & columns, ContextPtr global_context,
const std::string & table_name, const std::string & compression_method_) const override;
const char * getStorageTypeName() const override { return "File"; }
};
}
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