Method writeToCatalog

src/Statistics/StatisticsCollector.cpp:74–99

}

void StatisticsCollector::writeToCatalog()
{
    if (!catalog)
    {
        throw Exception("catalog is NULL", ErrorCodes::LOGICAL_ERROR);
    }
    StatsData data;
    data.table_stats = table_stats.writeToCollection();
    std::vector<String> columns;
    for (auto & [name, stats] : columns_stats)
    {
        columns.emplace_back(name);
        data.column_stats[name] = stats.writeToCollection();
    }
    auto proxy = createCachedStatsProxy(catalog, settings.cache_policy);
    auto cols_desc = catalog->filterCollectableColumns(table_info, columns);
    // drop old columns to ensure other data is deleted
    // especially when collecting statistics_collect_histogram=0
    proxy->dropColumns(table_info, cols_desc);
    proxy->put(table_info, std::move(data));
    catalog->invalidateClusterStatsCache(table_info);
    // clear udi whenever it is to create/drop stats
    // since after manual drop stats, users just don't want statistics,
    // so we needn't care about udi for auto stats until next insertion
    catalog->removeUdiCount(table_info);
}

void StatisticsCollector::readAllFromCatalog()
{