for issue #6474
```sql
create table test.table1 like test.table with rollup r1,r2 -- copy some rollup
create table test.table1 like test.table with rollup all -- copy all rollup
create table test.table1 like test.table -- only copy base table
```
Fix#6512
If there is missing replica for a tablet, clone task will be executed to restore missing replica from a healthy replica. Src replica selector will randomly choose a healthy replica as src replica.
It's better to choose the health replica with min version count as src replica so that it could avoid repetitive compaction task. In addition, replica with less version count is good for query performance.
fix#6447
1. FE master regularly triggers the remove operation
2. After the master completes the removal of deleteInfo, it is synchronized to the Follower through editlog for remove
3. When the DeleteInfo creation time is longer than the current time, it will be cleaned up, which is determined by the `delete_info_keep_max_second` configuration
Implement the lower_case_table_names variable of mysql. The value meaning is as follows:
0: the table names are case-sensitive.
1: table names are stored in lowercase and comparisons are not case sensitive.
2: table names are stored as given but compared case-insensitively.
1. Add license/total line/release badegs.
2. Add monthly active contributor and contributor growth graph
3. fix a pom.xml bug
4. Modify some routine load log on BE side
This CL mainly changes:
1. the `storage_page_cache_limit` is based on config `mem_limit`
the default is 20% of `mem_limit`.
2. the `buffer_pool_limit` is based on config `mem_limit`
the default is 20% of `mem_limit`.
3. the `buffer_pool_clean_pages_limit` is based on config `buffer_pool_limit`
the default is 50% of `buffer_pool_limit`
4. Fix some show bugs of lru cache hit ratio and usage ratio
5. Fix a create view bug that `notEvalNondeterministicFunction` should be reset after analyze.
fix#6269
The outline of our changes is to improve our memory in case of OOM in BE and to speed up the calculation.
1. We do not need to do Aggregation in load, which has already been done in the ETL spark job.
2. Based on 1, we do not need to serialize/deserialize bitmap/HLL objects.
* Add statistics struct and Support manually inject statistics
This PR mainly developed the data structure used by statistical information
and the function of manually modifying the statistical information.
We use a statistics package alone to store statistical information,
and use the 'statistics manager' as a unified entry for statistical information.
For detailed data structure and explanation, please refer to the comments on the class.
Manually modify statistics include: Manually modify table statistics and column statistics.
The syntax is explained in the issue #6370.
* Show table and column statistics
'SHOW TABLE STATS' used to show the statistics of table.
'SHOW COLUMN STATS' used to show the statistics of columns.
Currently, only the tables and columns for setting statistics
will be displayed in the results.
