Crash when evaluating query that uses @count on list of primitive

[mitevdev]

class Entry: Object {
   let tags = List<String>()
}

and then later:

realm.objects(Entry.self).filter("tags.@count == 0")

Goals

fetch entries having no tags

Expected Results

Results instance

Actual Results

Exception EXC_BAD_ACCESS (code=1, address=0x0) in

• thread Adds new unit test for cursors. #10, name = 'RLMRealm notification listener', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  • frame #0: 0x0000000100462794 Realmrealm::LinkMap::map_links(unsigned long, unsigned long, realm::LinkMapFunction&) + 52 frame #1: 0x000000010046242b Realmrealm::LinkCount::evaluate(unsigned long, realm::ValueBase&) + 65
    frame Support for 'float' and 'double' column types and a lot of other fixes #2: 0x000000010045ff93 Realmrealm::Compare<realm::Equal, long long, realm::Subexpr, realm::Subexpr>::find_first(unsigned long, unsigned long) const + 113 frame #3: 0x00000001006ed410 Realmrealm::ParentNode::aggregate_local(realm::QueryStateBase_, unsigned long, unsigned long, unsigned long, realm::SequentialGetterBase_) + 144
    frame Explicit string size - Obj-C #4: 0x000000010067c15a Realmrealm::Query::aggregate_internal(realm::Action, realm::DataType, bool, realm::ParentNode_, realm::QueryStateBase_, unsigned long, unsigned long, realm::SequentialGetterBase*) const + 314 frame #5: 0x0000000100680ad8 Realmrealm::Query::find_all(realm::TableViewBase&, unsigned long, unsigned long, unsigned long) const + 440
    frame Tutorial (./examples/tutorial.m) ready for inspection and upload if found ok. #6: 0x0000000100681ff6 Realmrealm::Query::find_all(unsigned long, unsigned long, unsigned long) + 102 frame #7: 0x000000010041485b Realmrealm::impl::ResultsNotifier::run() + 119
    frame Fix for memory leakage when typed tables are created in a group. #8: 0x00000001004054c2 Realmrealm::_impl::RealmCoordinator::run_async_notifiers() + 1730 frame #9: 0x0000000100404da8 Realmrealm::impl::RealmCoordinator::on_change() + 18
    frame Adds new unit test for cursors. #10: 0x00000001003eba11 Realmrealm::_impl::ExternalCommitHelper::listen() + 191 frame #11: 0x00000001003ebe2e Realmstd::*1::*async_funcrealm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0::operator()() + 18
    frame Update examples #12: 0x00000001003ebdba Realmstd::*1::*async_assoc_state<void, std::*1::*async_func<realm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0> >::__execute() + 26 frame #13: 0x00000001003ebf4b Realmstd::*1::*thread_proxy<std::*1::tuple<std::*1::unique_ptr<std::*1::*thread_struct, std::*1::default_deletestd::*1::*thread_struct >, void (std::*1::*async_assoc_state<void, std::*1::__async_funcrealm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0 >::)(), std::*1::*async_assoc_state<void, std::*1::*async_funcrealm::_impl::ExternalCommitHelper::ExternalCommitHelper(realm::_impl::RealmCoordinator&)::$_0 >> >(void_, void_) + 62
    frame added xcode project to examples #14: 0x00000001052f26c1 libsystem_pthread.dylib_pthread_body + 340 frame #15: 0x00000001052f256d libsystem_pthread.dylib_pthread_start + 377
    frame Now using new Descriptor based API (Spec is no longer a public class) #16: 0x00000001052f1c5d libsystem_pthread.dylib`thread_start + 13

Steps to Reproduce

create and store Instance of Entry and try to filter using @count aggregate function == 0

Version of Realm and Tooling

ProductName:	Mac OS X
ProductVersion:	10.13.1
BuildVersion:	17B48

/Applications/Xcode.app/Contents/Developer
Xcode 9.1
Build version 9B55


(not in use here)

/bin/bash
GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin17)


(not in use here)

/usr/bin/git
git version 2.13.6 (Apple Git-96)

[bdash]

Note that queries involving arrays of primitives are not yet supported (#5334). We should be catching this and throwing a meaningful exception, though.

[mitevdev]

Correct. This is exactly what I was expecting once I realised that arrays of primitives are not supported in queries yet.

[tgoyne]

This was implemented in 10.7.0.