eZ\Publish\Core\Persistence\Legacy\Content\FieldValue\Converter\RelationConverter::getIndexColumn PHP Method

getIndexColumn() public method

Returns the name of the index column the datatype uses, which is either "sort_key_int" or "sort_key_string". This column is then used for filtering and sorting for this type.
public getIndexColumn ( ) : false
return false
    public function getIndexColumn()
    {
        return 'sort_key_int';
    }