/**
* Add a not null condition to the condition array.
* The order of the method call is important, in which way the condition string will
* concatenate.
*
* @param ColumnInterface $column Name of the column to compare.
*
* @return $this The same instance to concatenate methods.
*/
public function notNull(ColumnInterface $column)
{
$columnName = $column->getAlias() ?: $column->getColumnName();
$condition = $columnName . ' IS NOT NULL';
$this->_addCondition($condition);
return $this;
}
