protected function _add_simple_condition($type, $column_name, $separator, $value)
{
// Add the table name in case of ambiguous columns
if (count($this->_join_sources) > 0 && strpos($column_name, '.') === false) {
$table = $this->_table_name;
if (!is_null($this->_table_alias)) {
$table = $this->_table_alias;
}
$column_name = "{$table}.{$column_name}";
}
$column_name = $this->_quote_identifier($column_name);
return $this->_add_condition($type, "{$column_name} {$separator} ?", $value);
}