When filtering / enumerating the objects that don't match the predicate are not released

[beloso]

I am trying to enumerate a database finding only the values that match a given predicate.

Here is my code:

        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ANY SELF.names BEGINSWITH[cd] %@", searchText];
        @autoreleasepool {
            [self.datastore enumerateKeysAndObjectsBackward:NO
                                                     lazily:NO
                                              startingAtKey:nil
                                        filteredByPredicate:predicate
                                                  andPrefix:nil
                                                 usingBlock:^(LevelDBKey *key, id value, BOOL *stop){
                                                         [self.searchResults addObject:value];
                                                 }];
        }
        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            [self.searchDisplayController.searchResultsTableView reloadData];
        }];

The thing is that while enumerating Objective-LevelDB keeps all values in memory, even the ones that don't match the predicate. Not even lazy evaluation solves the issue here.

Am I doing something wrong? Can something be done to improve on memory usage?

[beloso]

I have added an @autoreleasepool within your for loop in the enumeration method. It did improve the memory footprint, however I am not sure if the autoreleasepool is apliable there. I am no expert in memory handling.

[matehat]

Thanks for reporting this, and sorry about the delay responding to your issue! I will investigate this in depth this week.

[hanishabsigh]

@tiagoveloso where did you add the @autoreleasepool? I tried adding it in a few places with no luck. @matehat did you ever get around to looking at this? Thanks guys!

[hanishabsigh]

just for more context, I'm using this from Swift and seeing tons of memory growth on both writes and reads