Function mixColumns

src/Processors/Transforms/AddingDefaultsTransform.cpp:120–146

}

static MutableColumnPtr mixColumns(const ColumnWithTypeAndName & col_read,
    const ColumnWithTypeAndName & col_defaults,
    const BlockMissingValues::RowsBitMask & defaults_mask)
{
    size_t column_size = col_read.column->size();
    size_t defaults_needed = defaults_mask.size();

    MutableColumnPtr column_mixed = col_read.column->cloneEmpty();

    for (size_t i = 0; i < defaults_needed; ++i)
    {
        if (defaults_mask[i])
        {
            if (isColumnConst(*col_defaults.column))
                column_mixed->insert((*col_defaults.column)[i]);
            else
                column_mixed->insertFrom(*col_defaults.column, i);
        }
        else
            column_mixed->insertFrom(*col_read.column, i);
    }

    for (size_t i = defaults_needed; i < column_size; ++i)
        column_mixed->insertFrom(*col_read.column, i);

    return column_mixed;
}


AddingDefaultsTransform::AddingDefaultsTransform(