entity-store/src/main/java/jetbrains/exodus/entitystore/iterate/MergeSortedIterable.java [134:164]:
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            for (final EntityIterable it : sorted) {
                final EntityIterator i = it.iterator();
                if (i.hasNext()) {
                    final EntityId id = i.nextId();
                    if (id != null) {
                        queue.add(new EntityWithSource(id, i));
                    }
                }
            }
        }

        @Override
        protected boolean hasNextImpl() {
            return !queue.isEmpty();
        }

        @Override
        public EntityId nextIdImpl() {
            final EntityWithSource pair = queue.poll();
            final EntityId result = pair.id;
            final EntityIterator i = pair.source;
            if (i.hasNext()) {
                queue.offer(new EntityWithSource(i.nextId(), i));
            }
            return result;
        }

        private final class EntityWithSource {

            private final EntityId id;
            private final EntityIterator source;
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entity-store/src/main/java/jetbrains/exodus/entitystore/iterate/MergeSortedIterableWithValueGetter.java [132:162]:
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            for (final EntityIterable it : sorted) {
                final EntityIterator i = it.iterator();
                if (i.hasNext()) {
                    final EntityId id = i.nextId();
                    if (id != null) {
                        queue.add(new EntityWithSource(id, i));
                    }
                }
            }
        }

        @Override
        protected boolean hasNextImpl() {
            return !queue.isEmpty();
        }

        @Override
        public EntityId nextIdImpl() {
            final EntityWithSource pair = queue.poll();
            final EntityId result = pair.id;
            final EntityIterator i = pair.source;
            if (i.hasNext()) {
                queue.offer(new EntityWithSource(i.nextId(), i));
            }
            return result;
        }

        private final class EntityWithSource {

            private final EntityId id;
            private final EntityIterator source;
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