Tiledb

Bug fixes
* Fix rare read corruption in S3 [2254](https://github.com/TileDB-Inc/TileDB/pull/2254)
* Write fix for unordered writes on nullable, fixed attributes [2241](https://github.com/TileDB-Inc/TileDB/pull/2241)

Disk Format

Breaking C API changes

Breaking behavior

New features
* Support TILEDB_DATETIME_{SEC,MS,US,NS} in arrow_io_impl.h [2229](https://github.com/TileDB-Inc/TileDB/pull/2229)
* Add support for serialization of config objects [2164](https://github.com/TileDB-Inc/TileDB/pull/2164)
* Add support for serialization of query config [2177](https://github.com/TileDB-Inc/TileDB/pull/2177)

Improvements
* Optimize `Subarray::compute_relevant_fragments` [2218](https://github.com/TileDB-Inc/TileDB/pull/2218)
* Reduces memory usage in multi-range range reads [2165](https://github.com/TileDB-Inc/TileDB/pull/2165)
* Add config option `sm.read_range_oob` to toggle bounding read ranges to domain or erroring [2162](https://github.com/TileDB-Inc/TileDB/pull/2162)
* Updates bzip2 to v1.0.8 on Linux/OSX [2233](https://github.com/TileDB-Inc/TileDB/pull/2233)

Deprecations

Bug fixes
* Fixes a potential memory leak in the filter pipeline [2185](https://github.com/TileDB-Inc/TileDB/pull/2185)
* Fixes misc memory leaks in the unit tests [2183](https://github.com/TileDB-Inc/TileDB/pull/2183)
* Fix memory leak of `tiledb_config_t` in error path of `tiledb_config_alloc`. [2178](https://github.com/TileDB-Inc/TileDB/pull/2178)

API additions

C API
* tiledb_query_get_array now returns a deep-copy [2188](https://github.com/TileDB-Inc/TileDB/pull/2188)
* Add new api,`tiledb_query_get_config` to get a query's config. [2167](https://github.com/TileDB-Inc/TileDB/pull/2167)
* Added `tiledb_serialize_config` and `tiledb_deserialize_config` [2164](https://github.com/TileDB-Inc/TileDB/pull/2164)

C++ API
* Add new api, `Query.config()` to get a query's config. [2167](https://github.com/TileDB-Inc/TileDB/pull/2167)

Improvements

* Added config option vfs.gcs.request_timeout_ms [2148](https://github.com/TileDB-Inc/TileDB/pull/2148)
* Improve fragment info loading by parallelizing fragment_size requests [2143](https://github.com/TileDB-Inc/TileDB/pull/2143)
* Apply 'var_offsets.extra_element' mode to string dimension offsets too [2145](https://github.com/TileDB-Inc/TileDB/pull/2145)

Bug fixes

* Fixes a potential crash when retrying incomplete reads [2137](https://github.com/TileDB-Inc/TileDB/pull/2137)

New features

* Config option vfs.s3.sse for S3 server-side encryption support [2130](https://github.com/TileDB-Inc/TileDB/pull/2130)

Improvements

* Reduced memory consumption in the read path for multi-range reads. [2118](https://github.com/TileDB-Inc/TileDB/pull/2118)
* Cache non_empty_domain for REST arrays like all other arrays [2105](https://github.com/TileDB-Inc/TileDB/pull/2105)
* Add additional timer statistics for openning array for reads [2027](https://github.com/TileDB-Inc/TileDB/pull/2027)
* Allow open array stats to be printed without read query [2131](https://github.com/TileDB-Inc/TileDB/pull/2131)

Bug fixes
* Fixes a potential crash when opening an array with consolidated fragment metadata [2135](https://github.com/TileDB-Inc/TileDB/pull/2135)
* Corrected a bug where sparse cells may be incorrectly returned using string dimensions. [2125](https://github.com/TileDB-Inc/TileDB/pull/2125)
* Always use original buffer size in serialized read queries serverside. [2115](https://github.com/TileDB-Inc/TileDB/pull/2115)
* Fix segfault in serialized queries when partition is unsplittable [2120](https://github.com/TileDB-Inc/TileDB/pull/2120)

Improvements

* Add additional stats printing to breakdown read state initialization timings [2095](https://github.com/TileDB-Inc/TileDB/pull/2095)
* Improve GCS multipart locking [2087](https://github.com/TileDB-Inc/TileDB/pull/2087)

Bug fixes
* Fix an edge-case where a read query may hang on array with string dimensions [2089](https://github.com/TileDB-Inc/TileDB/pull/2089)
* Fix mutex locking bugs on Windows due to unlocking on different thread and missing task join [2077](https://github.com/TileDB-Inc/TileDB/pull/2077)

C++ API
* Add support for a string-typed, variable-sized, nullable attribute in the C++ API. [2090](https://github.com/TileDB-Inc/TileDB/pull/2090)