code: public function withQualifiedColumn($column)
      {
          $parts = explode('.', $column);
  
          if (!isset($parts[1])) {
              throw new \InvalidArgumentException('Expecting a valid qualified column name.');
          }
  
          $this->withColumn($parts[1]);
  
          return $this;
      }
docs: Set the cursor column.
  
  @param $column
  @return $this
  @todo 2.0 pass qualified columns to the cursor builder.