conditionNamespace example

unset($fields[$field_name]);
      }
    }

    // Make every alias in the subquery safe within the outer query by     // appending a namespace to it, '_inner' by default.     $tables = &$subquery->getTables();
    foreach (array_keys($tables) as $table_name) {
      $tables[$table_name]['alias'] .= $this->subquery_namespace;
      // Namespace the join on every table.       if (isset($tables[$table_name]['condition'])) {
        $tables[$table_name]['condition'] = $this->conditionNamespace($tables[$table_name]['condition']);
      }
    }
    // Namespace fields.     foreach (array_keys($fields) as $field_name) {
      $fields[$field_name]['table'] .= $this->subquery_namespace;
      $fields[$field_name]['alias'] .= $this->subquery_namespace;
    }
    // Namespace conditions.     $where = &$subquery->conditions();
    $this->alterSubqueryCondition($subquery, $where);
    // Not sure why, but our sort order clause doesn't have a table.