<column name="practitioner_id" class="AmritaPractitionerUiComponentListingColumnPractitioner">
            <argument name="data" xsi:type="array">
                <item name="config" xsi:type="array">
                    <item name="filter" xsi:type="string">text</item>
                    <item name="label" xsi:type="string" translate="true">Practitioner</item>
                    <item name="sortable" xsi:type="string">true</item>
                </item>
            </argument>
        </column>

/**
 * @param array $dataSource
 * @return array
 */
public function prepareDataSource(array $dataSource)
{
    if (isset($dataSource['data']['items'])) {
        foreach ($dataSource['data']['items'] as & $item) {
            $name = $this->getData('name');
            try {
                $practitioner = $this->practitionerRepository->getById($item[$name]);
                $item[$name] = $practitioner->getName();
            } catch (NoSuchEntityException $e) {
                $item[$name] = __('-');
            }
        }
    }
    return $dataSource;
}