Realm Core v13.8.0

Enhancements

• Performance improvement for the following queries (6376):
  • Significant (~75%) improvement when counting (Query::count()) the number of exact matches (with no other query conditions) on a string/int/UUID/ObjectID property that has an index. This improvement will be especially noticiable if there are a large number of results returned (duplicate values).
  • Significant (~99%) improvement when querying for an exact match on a Timestamp property that has an index.
  • Significant (~99%) improvement when querying for a case insensitive match on a Mixed property that has an index.
  • Moderate (~25%) improvement when querying for an exact match on a Boolean property that has an index.
  • Small (~5%) improvement when querying for a case insensitive match on a Mixed property that does not have an index.
• Expose Results::is_valid() in the C API, in order to prevent to use an invalid Results. (PR #6407)
• Restore SyncManager::set_logger_factory() to enable setting different loggers for different SyncManagers (PR #6400).

Fixed

• Fixed a crash when querying a mixed property with a string operator (contains/like/beginswith/endswith) or with case insensitivity. (#6376 since introduction of Mixed)
• Querying for equality of a string on an indexed mixed property was returning case insensitive matches. For example querying for myIndexedMixed == "Foo" would incorrectly match on values of "foo" or "FOO" etc. (#6376 since introduction of Mixed)
• Adding an index to a Mixed property on a non-empty table would crash with an assertion. (#6376 since introduction of Mixed)
• SyncSession::pause() could hold a reference to the database open after shutting down the sync session, preventing users from being able to delete the realm. (#6372, since v13.3.0)
• Logger::set_default_logger() did not perform any locking, resulting in data races if it was called while the default logger was being read on another thread (#6398, since v13.7.0).

Breaking changes

• None.

Compatibility

• Fileformat: Generates files with format v23. Reads and automatically upgrade from fileformat v5.

Internals

• Add admin api and test for performing the PBS->FLX migration and roll back on the server. (PR #6366)
• Integrate protocol support for PBS->FLX client migration (#6355)
• SyncManager::reset_for_testing() could race with SyncSession's being torn down in other threads causing an assertion for REALM_ASSERT_RELEASE(no_sessions) to fail. SyncManager::reset_for_testing() now waits/yields for up to 5 seconds for sessions being torn down in other threads to finish tearing down before checking this assertion. (#6271)
• Update event loop to keep full stack trace if no observer is used (#6410)
• SyncSession::OnlyForTesting::handle_error() now takes a realm::sync:SessionErrorInfo instead of a realm::SyncError to reflect internal refactoring (#6433).