Method merge

src/function/table/cache_column.cpp:67–73

    }

    void merge(node_group_idx_t nodeGroupIdx,
        std::unique_ptr<storage::ColumnChunkData> columnChunkData) {
        std::unique_lock lck{mtx};
        DASSERT(cachedColumn->columnChunks.size() > nodeGroupIdx);
        cachedColumn->columnChunks[nodeGroupIdx] = std::move(columnChunkData);
        ++numNodeGroupsCached;
    }

    std::mutex mtx;
    storage::NodeTable& table;