thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-11-22 15:42:02 +00:00
Code Issues Packages Projects Releases Wiki Activity

table function file - use only FileStorage [#add_table_function_file]

Browse Source
This commit is contained in:
decaseal 2018-04-10 10:26:33 +03:00
parent 279fa17ff6
commit a2db6db50c
2 changed files with 8 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
dbms/src/TableFunctions/TableFunctionFile.cpp
View File

@ -37,8 +37,8 @@ namespace DB
ASTs & args = typeid_cast<ASTExpressionList &>(*args_func.at(0)).children;
if (args.size() != 3 && args.size() != 4)
throw Exception("Table function 'file' requires exactly 3 or 4 arguments: path, format, structure and useStorageMemory.",
if (args.size() != 3)
throw Exception("Table function 'file' requires exactly 3 arguments: path, format and structure.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
for (size_t i = 0; i < 3; ++i)
@ -47,18 +47,6 @@ namespace DB
std::string path = static_cast<const ASTLiteral &>(*args[0]).value.safeGet<String>();
std::string format = static_cast<const ASTLiteral &>(*args[1]).value.safeGet<String>();
std::string structure = static_cast<const ASTLiteral &>(*args[2]).value.safeGet<String>();
uint64_t useStorageMemory = 0;
if (args.size() == 4)
useStorageMemory = static_cast<const ASTLiteral &>(*args[3]).value.safeGet<UInt64>();
std::string clickhouse_data_path = context.getPath() + "data/";
Poco::Path poco_path = Poco::Path(path);
if (poco_path.isRelative())
poco_path = Poco::Path(clickhouse_data_path, poco_path);
std::string absolute_path = poco_path.absolute().toString();
// Create sample block
std::vector<std::string> structure_vals;
@ -81,37 +69,9 @@ namespace DB
// Create table
ColumnsDescription columns = ColumnsDescription{sample_block.getNamesAndTypesList()};
StoragePtr storage;
if (useStorageMemory)
{
// Validate path
if (!startsWith(absolute_path, clickhouse_data_path))
throw Exception("Part path " + absolute_path + " is not inside " + clickhouse_data_path, ErrorCodes::DATABASE_ACCESS_DENIED);
// Create Storage Memory
storage = StorageMemory::create(getName(), columns);
storage->startup();
BlockOutputStreamPtr output = storage->write(ASTPtr(), context.getSettingsRef());
// Write data
std::unique_ptr<ReadBuffer> read_buffer = std::make_unique<ReadBufferFromFile>(absolute_path);
BlockInputStreamPtr data = std::make_shared<AsynchronousBlockInputStream>(context.getInputFormat(
format, *read_buffer, sample_block, DEFAULT_BLOCK_SIZE));
data->readPrefix();
output->writePrefix();
while(Block block = data->read())
output->write(block);
data->readSuffix();
output->writeSuffix();
}
else
{
Context var_context = context;
storage = StorageFile::create(absolute_path, -1, clickhouse_data_path, getName(), format, columns, var_context);
storage->startup();
}
std::string clickhouse_data_path = context.getPath() + "data/";
StoragePtr storage = StorageFile::create(path, -1, clickhouse_data_path, getName(), format, columns, const_cast<Context &>(context));
storage->startup();
return storage;
}

6
dbms/src/TableFunctions/TableFunctionFile.h
View File

@ -6,11 +6,11 @@
namespace DB
{
/* file(path, format, structure, useStorageMemory) - creates a temporary storage from file
/* file(path, format, structure) - creates a temporary storage from file
*
*
* The file must be in the current database data directory.
* The relative path begins with the current database data directory.
* The file must be in the clickhouse data directory.
* The relative path begins with the clickhouse data directory.
*/
class TableFunctionFile : public ITableFunction
{