Starrocks

Improvement
* bucket shuffle join support right join and full outer join(1209) (1234)

Major Bugfix
* Support push down predicate through repeat node(1410) (1417)
* Fix routine load data losing bug when FE master changed (1074) (1272)
* Fix create view failed with union (1083)
* Fix some Hive external table stability issues(1408)
* Fix select group by view error (1231)

Improvement

* Optimize the performance of `show frontends`. [ 507](https://github.com/StarRocks/starrocks/pull/507) [# 984](https://github.com/StarRocks/starrocks/pull/984)
* Add monitoring of slow queries and meta logs. [ 502](https://github.com/StarRocks/starrocks/pull/502) [# 891](https://github.com/StarRocks/starrocks/pull/891)
* Optimize the fetching of Hive external metadata to achieve parallel fetching.[ 425](https://github.com/StarRocks/starrocks/pull/425) [# 451](https://github.com/StarRocks/starrocks/pull/451)

BugFix

* Fix the problem of Thrift protocol compatibility, so that the Hive external table can be connected with Kerberos. [ 184](https://github.com/StarRocks/starrocks/pull/184) [# 947](https://github.com/StarRocks/starrocks/pull/947) [# 995](https://github.com/StarRocks/starrocks/pull/995) [# 999](https://github.com/StarRocks/starrocks/pull/999)
* Fix several bugs in view creation. [ 972](https://github.com/StarRocks/starrocks/pull/972) [# 987](https://github.com/StarRocks/starrocks/pull/987)[# 1001](https://github.com/StarRocks/starrocks/pull/1001)
* Fix the problem that FE cannot be upgraded in grayscale. [ 485](https://github.com/StarRocks/starrocks/pull/485) [# 890](https://github.com/StarRocks/starrocks/pull/890)

New Feature
- Implement Global Runtime Filter, which can enable runtime filter for shuffle join.
- CBO Planner is enabled by default, improved colocated join, bucket shuffle, statistical information estimation, etc.
- [Experimental Function] Primary Key model release: To better support real-time/frequent update features, StarRocks has added a new table type: primary key model. The model supports Stream Load, Broker Load, Routine Load, JSON import, and also provides a second-level synchronization tool for MySQL data based on Flink-cdc.
- [Experimental Function] Support write function for external tables. Support writing data to another StarRocks cluster table by external tables to solve the read/write separation requirement and provide better resource isolation.

Improvement
- Performance optimization.
- count distinct int statement
- group by int statement
- or statement
- Optimize disk balance algorithm. Data can be automatically balanced after adding disks to a single machine.
- Support partial column export.
- Optimize `show processlist` to show specific SQL.
- Support multiple variable settings in SET_VAR .
- Improve the error reporting information, including table_sink, routine load, creation of materialized view, etc.

Bugfix
- Fix the issue that the dynamic partition table cannot be created automatically after the data recovery operation is completed. 337
- Fix the problem of error reported by row_number function after CBO is opened.
- Fix the problem of FE stuck due to statistical information collection
- Fix the problem that set_var takes effect for session but not for statements.
- Fix the problem that select count(*) returns abnormality on the Hive partition external table.