This pull request includes some implementations of the statistics(#6370), it adds statistics module related syntax. The current syntax for collecting statistics will not collect statistics (It will collect statistics until test is stable).
- `ANALYZE` syntax(collect statistics)
```SQL
ANALYZE [[ db_name.tb_name ] [( column_name [, ...] )], ...] [PARTITIONS(...)] [ PROPERTIES(...) ]
```
> db_name.tb_name: collect table and column statistics from tb_name.
> column_name: collect column statistics from column_name.
> properties: properties of statistics jobs.
example：
```SQL
ANALYZE; -- collect statistics for all tables in the current database
ANALYZE table1(pv, citycode); -- collect pv and citycode statistics for table1
ANALYZE test.table2 PARTITIONS(partition1); -- collect statistics for partition1 of table2
```
- `SHOW ANALYZE` syntax(show statistics job info)
```SQL
SHOW ANALYZE
[TABLE | ID]
[
WHERE
[STATE = ["PENDING"|"SCHEDULING"|"RUNNING"|"FINISHED"|"FAILED"|"CANCELLED"]]
]
[ORDER BY ...]
[LIMIT limit][OFFSET offset];
```
- `SHOW TABLE STATS`syntax(show table statistics)
```SQL
SHOW TABLE STATS [ db_name.tb_name ]
```
- `SHOW COLUMN STATS` syntax(show column statistics)
```SQL
SHOW COLUMN STATS [ db_name.tb_name ]
```
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