public function deleteFromColumn($family, $qualifier, array $timeRange = [])
    {
        $deleteFromColumn = (new DeleteFromColumn)
            ->setFamilyName($family)
            ->setColumnQualifier($qualifier);
        if (!empty($timeRange)) {
            $timestampRange = new TimestampRange;
            if (isset($timeRange['start'])) {
                $timestampRange->setStartTimestampMicros($timeRange['start']);
            }
            if (isset($timeRange['end'])) {
                $timestampRange->setEndTimestampMicros($timeRange['end']);
            }
            $deleteFromColumn->setTimeRange($timestampRange);
        }
        $this->mutations[] = (new Mutation)->setDeleteFromColumn($deleteFromColumn);
        return $this;
    }