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sql-statement-drop-stats: fix STATS_META output after DROP STATS #23557

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sql-statement-drop-stats: fix STATS_META output after DROP STATS #23557

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11 changes: 10 additions & 1 deletion sql-statements/sql-statement-drop-stats.md
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Expand Up @@ -81,12 +81,21 @@ DROP STATS t;
Query OK, 0 rows affected (0.00 sec)
```

After `DROP STATS`, `SHOW STATS_META` still returns the table's row count
and modify count. `DROP STATS` clears histogram-related statistics such as
TopN and buckets, but does not delete the `STATS_META` row.

```sql
SHOW STATS_META WHERE db_name='test' and table_name='t';
```

```
Empty set (0.00 sec)
+---------+------------+----------------+---------------------+--------------+-----------+
| Db_name | Table_name | Partition_name | Update_time | Modify_count | Row_count |
+---------+------------+----------------+---------------------+--------------+-----------+
| test | t | | 2020-05-25 20:34:33 | 0 | 0 |
+---------+------------+----------------+---------------------+--------------+-----------+
1 row in set (0.00 sec)
```

## MySQL compatibility
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