thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-11-24 00:22:29 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge

Browse Source
This commit is contained in:
Andrey Mironov 2015-09-18 15:40:09 +03:00
parent 9b9e5bedf4
commit 38ae453855
1 changed files with 20 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
dbms/include/DB/Storages/MergeTree/MergeTreeData.h
View File

@ -177,31 +177,36 @@ public:
DataPart(MergeTreeData & storage_) : storage(storage_) {} DataPart(MergeTreeData & storage_) : storage(storage_) {}
/** If no checksums are present returns name for the first physically existing column. /// Returns the size of .bin file for column `name` if found, zero otherwise
* Either returns a name or throws .*/ std::size_t getColumnSize(const String & name) const
std::string getMinimumSizeColumnName() const {
if (checksums.empty())
return {};
const auto & files = checksums.files;
const auto bin_file_name = escapeForFileName(name) + ".bin";
/// Probably a logic error, not sure if this can ever happen if checksums are not empty
if (0 == files.count(bin_file_name))
return {};
return files.find(bin_file_name)->second.file_size;
}
/** Returns the name of a column with minimum compressed size (as returned by getColumnSize()).
* If no checksums are present returns the name of the first physically existing column. */
String getMinimumSizeColumnName() const
{ {
const auto & columns = storage.getColumnsList(); const auto & columns = storage.getColumnsList();
const std::string * minimum_size_column = nullptr; const std::string * minimum_size_column = nullptr;
auto minimum_size = std::numeric_limits<std::size_t>::max(); auto minimum_size = std::numeric_limits<std::size_t>::max();
/// return .bin file size or zero if checksums are empty
const auto get_column_size = [this] (const String & name) {
const auto & files = checksums.files;
const auto bin_file_name = escapeForFileName(name) + ".bin";
if (0 != files.count(bin_file_name))
return files.find(bin_file_name)->second.file_size;
return std::size_t{};
};
for (const auto & column : columns) for (const auto & column : columns)
{ {
if (!hasColumnFiles(column.name)) if (!hasColumnFiles(column.name))
continue; continue;
const auto size = get_column_size(column.name); const auto size = getColumnSize(column.name);
if (size < minimum_size) if (size < minimum_size)
{ {
minimum_size = size; minimum_size = size;