mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-16 11:22:12 +00:00
39 lines
804 B
C++
39 lines
804 B
C++
#include <Storages/MergeTree/AllMergeSelector.h>
|
|
|
|
#include <cmath>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
AllMergeSelector::PartsInPartition AllMergeSelector::select(
|
|
const Partitions & partitions,
|
|
const size_t /*max_total_size_to_merge*/)
|
|
{
|
|
size_t min_partition_size = 0;
|
|
Partitions::const_iterator best_partition;
|
|
|
|
for (auto it = partitions.begin(); it != partitions.end(); ++it)
|
|
{
|
|
if (it->size() <= 1)
|
|
continue;
|
|
|
|
size_t sum_size = 0;
|
|
for (const auto & part : *it)
|
|
sum_size += part.size;
|
|
|
|
if (!min_partition_size || sum_size < min_partition_size)
|
|
{
|
|
min_partition_size = sum_size;
|
|
best_partition = it;
|
|
}
|
|
}
|
|
|
|
if (min_partition_size)
|
|
return *best_partition;
|
|
else
|
|
return {};
|
|
}
|
|
|
|
}
|