This is a force fix for potential existence filter mismatches caused by
firebase/firebase-ios-sdk#1548
The essential problem is that when resuming a query, the server is
allowed to forget deletes. If the number of incorrectly synthesized
deletes matches the number of server-forgotten deletes then the
existence filter can give a false positive, preventing the cache from
self healing.
Dropping the query cache clears any client-side resume token which
prevents a false positive existence filter mismatch.
Note that the remote document cache and mutation queues are unaffected
so any cached documents that do exist will still work while offline
https://github.com/firebase/firebase-js-sdk/pull/1019
* Start work on leveldb transactions
* Style
* Working API. Not plumbed in yet
* Move files into correct place
* Wrangling file locations and associations
* Tests pass
* Add some comments
* style
* Fix copyright
* Rewrite iterator internals to handle deletion-while-iterating. Also add tests for same
* Switch to strings instead of slices
* Style
* More style fixes
* Start switching writegroup over
* Swap out write group tracking for transaction usage
* Style
* Response to feedback before updating docs
* Style
* Add comment
* Initialize version_
* Satisfy the linter
* Start switching writegroup over
* Swap out write group tracking for transaction usage
* Style
* Checkpoint before implementing BatchDescription
* Style
* Everything passing
* Drop unused function
* Style
* Renaming
* Style
* Add log line
* Style
* Add debug log line for commits, drop unused BatchDescription
* Move all Firestore files to Objective-C++
* Update project file references
* Don't use module imports from Objective-C++
* Use extern "C" for C-accessible globals
* Work around more stringent type checking in Objective-C++
* NSMutableDictionary ivars aren't implicitly casted to NSDictionary
* FSTMaybeDocument callback can't be passed a function that accepts
FSTDocument
* NSComparisonResult can't be multiplied by -1 without casting
* Add a #include <inttypes.h> where needed
* Avoid using C++ keywords as variables
* Remove #if __cplusplus guards
* Implement schema versions
* Style fixes
* newlines, copyrights, assumptions
* Fix nullability
* Raw ptr -> shared_ptr
* kVersionTableGlobal -> kVersionGlobalTable
* Drop utils, move into static methods
* Drop extra include
* Add a few more comments
* Move version constant into migrations file
* formatting?
* Fix comment
Gil