1a6401d682
1. Supports sampling to collect statistics
2. Improved syntax for collecting statistics
3. Support histogram specifies the number of buckets
4. Tweaked some code structure
---
The syntax supports WITH and PROPERTIES, using the same syntax as before.
Column Statistics Collection Syntax:
```SQL
ANALYZE [ SYNC ] TABLE table_name
[ (column_name [, ...]) ]
[ [WITH SYNC] | [WITH INCREMENTAL] | [WITH SAMPLE PERCENT | ROWS ] ]
[ PROPERTIES ('key' = 'value', ...) ];
```
Column histogram collection syntax:
```SQL
ANALYZE [ SYNC ] TABLE table_name
[ (column_name [, ...]) ]
UPDATE HISTOGRAM
[ [ WITH SYNC ][ WITH INCREMENTAL ][ WITH SAMPLE PERCENT | ROWS ][ WITH BUCKETS ] ]
[ PROPERTIES ('key' = 'value', ...) ];
```
Illustrate：
- sync：Collect statistics synchronously. Return after collecting.
- incremental：Collect statistics incrementally. Incremental collection of histogram statistics is not supported.
- sample percent | rows：Collect statistics by sampling. Scale and number of rows can be sampled.
- buckets：Specifies the maximum number of buckets generated when collecting histogram statistics.
- table_name: The purpose table for collecting statistics. Can be of the form `db_name.table_name`.
- column_name: The specified destination column must be a column that exists in `table_name`, and multiple column names are separated by commas.
- properties：Properties used to set statistics tasks. Currently only the following configurations are supported (equivalent to the with statement)
- 'sync' = 'true'
- 'incremental' = 'true'
- 'sample.percent' = '50'
- 'sample.rows' = '1000'
- 'num.buckets' = 10
---
TODO:
- Supplement the complete p0 test
- `Incremental` statistics see #18653
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