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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
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35
dbms/include/DB/Storages/MergeTree/MergeTreeData.h
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@ -177,31 +177,36 @@ public:
DataPart(MergeTreeData & storage_) : storage(storage_) {}
/** If no checksums are present returns name for the first physically existing column.
* Either returns a name or throws .*/
std::string getMinimumSizeColumnName() const
/// Returns the size of .bin file for column `name` if found, zero otherwise
std::size_t getColumnSize(const String & name) 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 std::string * minimum_size_column = nullptr;
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)
{
if (!hasColumnFiles(column.name))
continue;
const auto size = get_column_size(column.name);
const auto size = getColumnSize(column.name);
if (size < minimum_size)
{
minimum_size = size;