class ConditionAggregate

class ConditionAggregate extends ConditionAggregateBase {
  
  /**
   * The current SQL query, set by parent condition compile() method calls.
   *
   * @var \Drupal\Core\Database\Query\SelectInterface
   */
  protected SelectInterface $sqlQuery;
  
  /**
   * {@inheritdoc}
   */
  public function compile($conditionContainer) {
    // If this is not the top level condition group then the sql query is
    // added to the $conditionContainer object by this function itself. The
    // SQL query object is only necessary to pass to Query::addField() so it
    // can join tables as necessary. On the other hand, conditions need to be
    // added to the $conditionContainer object to keep grouping.
    $sql_query = $conditionContainer instanceof SelectInterface ? $conditionContainer : $this->sqlQuery;
    $tables = new Tables($sql_query);
    foreach ($this->conditions as $condition) {
      if ($condition['field'] instanceof ConditionAggregateInterface) {
        $sql_condition = $sql_query->getConnection()
          ->condition($condition['field']->getConjunction());
        // Add the SQL query to the object before calling this method again.
        $condition['field']->sqlQuery = $sql_query;
        $condition['field']->compile($sql_condition);
        $sql_query->condition($sql_condition);
      }
      else {
        $type = strtoupper($this->conjunction) == 'OR' || $condition['operator'] == 'IS NULL' ? 'LEFT' : 'INNER';
        $field = $tables->addField($condition['field'], $type, $condition['langcode']);
        $condition_class = QueryBase::getClass($this->namespaces, 'Condition');
        $condition_class::translateCondition($condition, $sql_query, $tables->isFieldCaseSensitive($condition['field']));
        $function = $condition['function'];
        $placeholder = ':db_placeholder_' . $conditionContainer->nextPlaceholder();
        $sql_field_escaped = '[' . str_replace('.', '].[', $field) . ']';
        $conditionContainer->having("{$function}({$sql_field_escaped}) {$condition['operator']} {$placeholder}", [
          $placeholder => $condition['value'],
        ]);
      }
    }
  }
  
  /**
   * {@inheritdoc}
   */
  public function exists($field, $function, $langcode = NULL) {
    return $this->condition($field, $function, NULL, 'IS NOT NULL', $langcode);
  }
  
  /**
   * {@inheritdoc}
   */
  public function notExists($field, $function, $langcode = NULL) {
    return $this->condition($field, $function, NULL, 'IS NULL', $langcode);
  }

}