Method writeWithPermutation

src/Storages/MergeTree/MergedBlockOutputStream.cpp:87–90

If the data is not sorted, but we pre-calculated the permutation, after which they will be sorted. * This method is used to save RAM, since you do not need to keep two blocks at once - the source and the sorted. */

    * This method is used to save RAM, since you do not need to keep two blocks at once - the source and the sorted.
    */
void MergedBlockOutputStream::writeWithPermutation(const Block & block, const IColumn::Permutation * permutation)
{
    writeImpl(block, permutation);
}

void MergedBlockOutputStream::writeSuffix()
{