public function removeColumn($index)
    {
        $this->mappingColumns = null;
        array_splice($this->columns, $index, 1);

        return $this;
    }
public function removeColumn($index)
    {
        $this->mappingColumns = null;
        array_splice($this->columns, $index, 1);

        return $this;
    }
public function removeColumn ( $ index ) { $ this -> mappingColumns = null ; array_splice ( $ this -> columns , $ index , 1 ) ; return $ this ; }
Remove column.

@param int $index

@return self
Remove column .