canBeMerged example

        $directReads = [];
        $searches = [];

        $criteriaCollection = $this->flattenCriteriaCollections($criteriaCollections);

        foreach ($criteriaCollection as $definition => $criteriaObjects) {
            $directReads[$definition] = [[]];
            $searches[$definition] = [];

            foreach ($criteriaObjects as $criteria) {
                if ($this->canBeMerged($criteria)) {
                    $directReads[$definition][] = $criteria->getIds();
                } else {
                    $criteriaHash = $this->hash($criteria);
                    $criteria->addExtension('criteriaHash', new ArrayEntity(['hash' => $criteriaHash]));
                    $searches[$definition][$criteriaHash] = $criteria;
                }
            }
        }

        foreach ($directReads as $definition => $idLists) {
            /** @var array<string, array<string>> $directReads */