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109 lines
3.5 KiB
C++
109 lines
3.5 KiB
C++
#pragma once
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#include <Storages/IStorage.h>
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#include <common/logger_useful.h>
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#include <atomic>
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#include <shared_mutex>
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#include <ext/shared_ptr_helper.h>
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namespace DB
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{
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class StorageFileBlockInputStream;
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class StorageFileBlockOutputStream;
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class StorageFile final : public ext::shared_ptr_helper<StorageFile>, public IStorage
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{
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friend struct ext::shared_ptr_helper<StorageFile>;
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public:
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std::string getName() const override { return "File"; }
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Pipe read(
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const Names & column_names,
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const StorageMetadataPtr & /*metadata_snapshot*/,
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SelectQueryInfo & query_info,
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ContextPtr context,
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QueryProcessingStage::Enum processed_stage,
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size_t max_block_size,
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unsigned num_streams) override;
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BlockOutputStreamPtr write(
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const ASTPtr & query,
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const StorageMetadataPtr & /*metadata_snapshot*/,
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ContextPtr context) override;
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void truncate(
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const ASTPtr & /*query*/,
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const StorageMetadataPtr & /* metadata_snapshot */,
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ContextPtr /* context */,
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TableExclusiveLockHolder &) override;
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void rename(const String & new_path_to_table_data, const StorageID & new_table_id) override;
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bool storesDataOnDisk() const override;
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Strings getDataPaths() const override;
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struct CommonArguments : public WithContext
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{
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StorageID table_id;
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std::string format_name;
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std::optional<FormatSettings> format_settings;
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std::string compression_method;
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const ColumnsDescription & columns;
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const ConstraintsDescription & constraints;
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const String & comment;
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};
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NamesAndTypesList getVirtuals() const override;
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static Strings getPathsList(const String & table_path, const String & user_files_path, ContextPtr context);
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/// Check if the format is column-oriented.
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/// Is is useful because column oriented formats could effectively skip unknown columns
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/// So we can create a header of only required columns in read method and ask
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/// format to read only them. Note: this hack cannot be done with ordinary formats like TSV.
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bool isColumnOriented() const;
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protected:
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friend class StorageFileSource;
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friend class StorageFileBlockOutputStream;
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/// From file descriptor
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StorageFile(int table_fd_, CommonArguments args);
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/// From user's file
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StorageFile(const std::string & table_path_, const std::string & user_files_path, CommonArguments args);
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/// From table in database
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StorageFile(const std::string & relative_table_dir_path, CommonArguments args);
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private:
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explicit StorageFile(CommonArguments args);
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std::string format_name;
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// We use format settings from global context + CREATE query for File table
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// function -- in this case, format_settings is set.
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// For `file` table function, we use format settings from current user context,
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// in this case, format_settings is not set.
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std::optional<FormatSettings> format_settings;
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int table_fd = -1;
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String compression_method;
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std::string base_path;
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std::vector<std::string> paths;
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bool is_db_table = true; /// Table is stored in real database, not user's file
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bool use_table_fd = false; /// Use table_fd instead of path
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std::atomic<bool> table_fd_was_used{false}; /// To detect repeating reads from stdin
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off_t table_fd_init_offset = -1; /// Initial position of fd, used for repeating reads
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mutable std::shared_timed_mutex rwlock;
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Poco::Logger * log = &Poco::Logger::get("StorageFile");
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};
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}
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