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[Doc] fix the behaviour of AUTO NULL PARTITION #481

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Mar 28, 2024
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[Doc] fix the behaviour of AUTO NULL PARTITION #481

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28 changes: 18 additions & 10 deletions docs/advanced/partition/auto-partition.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -183,7 +183,9 @@ mysql> select * from auto_null_list partition(pX);
1 row in set (0.20 sec)
```

2. In Doris, NULL values are included in the minimum value partition, whether they are AUTO PARTITION tables or not. Therefore, if a partition is automatically created for a NULL value, you get a partition starting with the minimum value:
2. For AUTO RANGE PARTITION, the storage of NULL values requires the manual creation of specific partitions.

In Doris' RANGE PARTITION, we do not use a separate NULL PARTITION to contain NULL values, but rather group them in the **minium LESS THAN partition**. For logical clarity, the AUTO RANGE PARTITION does not automatically create such a partition when it encounters a NULL value. If necessary, you can create such a partition yourself to contain NULL values.

```sql
mysql> CREATE TABLE `range_table_nullable` (
Expand All @@ -202,15 +204,21 @@ mysql> CREATE TABLE `range_table_nullable` (
Query OK, 0 rows affected (0.09 sec)

mysql> insert into range_table_nullable values (0, null, null);
Query OK, 1 row affected (0.21 sec)

mysql> show partitions from range_table_nullable;
+-------------+-----------------+----------------+---------------------+--------+--------------+----------------------------------------------------------------------------------------------------------+-----------------+---------+----------------+---------------+---------------------+---------------------+--------------------------+----------+------------+-------------------------+-----------+--------------------+--------------+
| PartitionId | PartitionName | VisibleVersion | VisibleVersionTime | State | PartitionKey | Range | DistributionKey | Buckets | ReplicationNum | StorageMedium | CooldownTime | RemoteStoragePolicy | LastConsistencyCheckTime | DataSize | IsInMemory | ReplicaAllocation | IsMutable | SyncWithBaseTables | UnsyncTables |
+-------------+-----------------+----------------+---------------------+--------+--------------+----------------------------------------------------------------------------------------------------------+-----------------+---------+----------------+---------------+---------------------+---------------------+--------------------------+----------+------------+-------------------------+-----------+--------------------+--------------+
| 457060 | p00000101000000 | 2 | 2024-03-25 03:01:38 | NORMAL | k2 | [types: [DATETIMEV2]; keys: [0000-01-01 00:00:00]; ..types: [DATETIMEV2]; keys: [0000-01-02 00:00:00]; ) | k1 | 16 | 1 | HDD | 9999-12-31 23:59:59 | | NULL | 0.000 | false | tag.location.default: 1 | true | true | NULL |
+-------------+-----------------+----------------+---------------------+--------+--------------+----------------------------------------------------------------------------------------------------------+-----------------+---------+----------------+---------------+---------------------+---------------------+--------------------------+----------+------------+-------------------------+-----------+--------------------+--------------+
1 row in set (0.09 sec)
ERROR 1105 (HY000): errCode = 2, detailMessage = [CANCELLED]TStatus: errCode = 2, detailMessage = Can't create partition for NULL Range

mysql> alter table range_table_nullable add partition pX VALUES LESS THAN ("1970-01-01");
Query OK, 0 rows affected (0.11 sec)

mysql> insert into range_table_nullable values (0, null, null);
Query OK, 1 row affected (0.18 sec)

mysql> select * from range_table_nullable;
+------+------+------+
| k1 | k2 | k3 |
+------+------+------+
| 0 | NULL | NULL |
+------+------+------+
1 row in set (0.18 sec)
```

## Sample Scenarios
Expand Down
28 changes: 18 additions & 10 deletions ...-CN/docusaurus-plugin-content-docs/current/advanced/partition/auto-partition.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -183,7 +183,9 @@ mysql> select * from auto_null_list partition(pX);
1 row in set (0.20 sec)
```

2. Doris 中，无论是否为 AUTO PARTITION 表，NULL 值都被包含在最小值分区内。因此，如果对 NULL 值自动创建分区，会得到一个最小值起始的分区：
2. 对于 AUTO RANGE PARTITION，NULL 值的存储需要手动创建特定的分区。

在 Doris 的 RANGE PARTITION 中，我们并不使用单独的 NULL PARTITION 来包含 NULL 值，而是将其归属于**最小的 LESS THAN 分区内**。为保持逻辑清晰，AUTO RANGE PARTITION 在遇到 NULL 值时不会自动创建这样的分区。如有需要，可以自行创建这样的分区，以包含 NULL 值。

```sql
mysql> CREATE TABLE `range_table_nullable` (
Expand All @@ -202,15 +204,21 @@ mysql> CREATE TABLE `range_table_nullable` (
Query OK, 0 rows affected (0.09 sec)

mysql> insert into range_table_nullable values (0, null, null);
Query OK, 1 row affected (0.21 sec)

mysql> show partitions from range_table_nullable;
+-------------+-----------------+----------------+---------------------+--------+--------------+----------------------------------------------------------------------------------------------------------+-----------------+---------+----------------+---------------+---------------------+---------------------+--------------------------+----------+------------+-------------------------+-----------+--------------------+--------------+
| PartitionId | PartitionName | VisibleVersion | VisibleVersionTime | State | PartitionKey | Range | DistributionKey | Buckets | ReplicationNum | StorageMedium | CooldownTime | RemoteStoragePolicy | LastConsistencyCheckTime | DataSize | IsInMemory | ReplicaAllocation | IsMutable | SyncWithBaseTables | UnsyncTables |
+-------------+-----------------+----------------+---------------------+--------+--------------+----------------------------------------------------------------------------------------------------------+-----------------+---------+----------------+---------------+---------------------+---------------------+--------------------------+----------+------------+-------------------------+-----------+--------------------+--------------+
| 457060 | p00000101000000 | 2 | 2024-03-25 03:01:38 | NORMAL | k2 | [types: [DATETIMEV2]; keys: [0000-01-01 00:00:00]; ..types: [DATETIMEV2]; keys: [0000-01-02 00:00:00]; ) | k1 | 16 | 1 | HDD | 9999-12-31 23:59:59 | | NULL | 0.000 | false | tag.location.default: 1 | true | true | NULL |
+-------------+-----------------+----------------+---------------------+--------+--------------+----------------------------------------------------------------------------------------------------------+-----------------+---------+----------------+---------------+---------------------+---------------------+--------------------------+----------+------------+-------------------------+-----------+--------------------+--------------+
1 row in set (0.09 sec)
ERROR 1105 (HY000): errCode = 2, detailMessage = [CANCELLED]TStatus: errCode = 2, detailMessage = Can't create partition for NULL Range

mysql> alter table range_table_nullable add partition pX VALUES LESS THAN ("1970-01-01");
Query OK, 0 rows affected (0.11 sec)

mysql> insert into range_table_nullable values (0, null, null);
Query OK, 1 row affected (0.18 sec)

mysql> select * from range_table_nullable;
+------+------+------+
| k1 | k2 | k3 |
+------+------+------+
| 0 | NULL | NULL |
+------+------+------+
1 row in set (0.18 sec)
```

## 场景示例
Expand Down
28 changes: 18 additions & 10 deletions ...docusaurus-plugin-content-docs/version-2.1/advanced/partition/auto-partition.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -185,7 +185,9 @@ mysql> select * from auto_null_list partition(pX);
1 row in set (0.20 sec)
```

2. Doris 中，无论是否为 AUTO PARTITION 表，NULL 值都被包含在最小值分区内。因此，如果对 NULL 值自动创建分区，会得到一个最小值起始的分区：
2. 对于 AUTO RANGE PARTITION，NULL 值的存储需要手动创建特定的分区。

在 Doris 的 RANGE PARTITION 中，我们并不使用单独的 NULL PARTITION 来包含 NULL 值，而是将其归属于**最小的 LESS THAN 分区内**。为保持逻辑清晰，AUTO RANGE PARTITION 在遇到 NULL 值时不会自动创建这样的分区。如有需要，可以自行创建这样的分区，以包含 NULL 值。

```sql
mysql> CREATE TABLE `range_table_nullable` (
Expand All @@ -204,15 +206,21 @@ mysql> CREATE TABLE `range_table_nullable` (
Query OK, 0 rows affected (0.09 sec)

mysql> insert into range_table_nullable values (0, null, null);
Query OK, 1 row affected (0.21 sec)

mysql> show partitions from range_table_nullable;
+-------------+-----------------+----------------+---------------------+--------+--------------+----------------------------------------------------------------------------------------------------------+-----------------+---------+----------------+---------------+---------------------+---------------------+--------------------------+----------+------------+-------------------------+-----------+--------------------+--------------+
| PartitionId | PartitionName | VisibleVersion | VisibleVersionTime | State | PartitionKey | Range | DistributionKey | Buckets | ReplicationNum | StorageMedium | CooldownTime | RemoteStoragePolicy | LastConsistencyCheckTime | DataSize | IsInMemory | ReplicaAllocation | IsMutable | SyncWithBaseTables | UnsyncTables |
+-------------+-----------------+----------------+---------------------+--------+--------------+----------------------------------------------------------------------------------------------------------+-----------------+---------+----------------+---------------+---------------------+---------------------+--------------------------+----------+------------+-------------------------+-----------+--------------------+--------------+
| 457060 | p00000101000000 | 2 | 2024-03-25 03:01:38 | NORMAL | k2 | [types: [DATETIMEV2]; keys: [0000-01-01 00:00:00]; ..types: [DATETIMEV2]; keys: [0000-01-02 00:00:00]; ) | k1 | 16 | 1 | HDD | 9999-12-31 23:59:59 | | NULL | 0.000 | false | tag.location.default: 1 | true | true | NULL |
+-------------+-----------------+----------------+---------------------+--------+--------------+----------------------------------------------------------------------------------------------------------+-----------------+---------+----------------+---------------+---------------------+---------------------+--------------------------+----------+------------+-------------------------+-----------+--------------------+--------------+
1 row in set (0.09 sec)
ERROR 1105 (HY000): errCode = 2, detailMessage = [CANCELLED]TStatus: errCode = 2, detailMessage = Can't create partition for NULL Range

mysql> alter table range_table_nullable add partition pX VALUES LESS THAN ("1970-01-01");
Query OK, 0 rows affected (0.11 sec)

mysql> insert into range_table_nullable values (0, null, null);
Query OK, 1 row affected (0.18 sec)

mysql> select * from range_table_nullable;
+------+------+------+
| k1 | k2 | k3 |
+------+------+------+
| 0 | NULL | NULL |
+------+------+------+
1 row in set (0.18 sec)
```

## 场景示例
Expand Down
2 changes: 1 addition & 1 deletion ...ual/sql-reference/Data-Manipulation-Statements/Manipulation/INSERT-OVERWRITE.md
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -142,7 +142,7 @@ PROPERTIES (

#### Overwrite Table Partition

> 该功能自 2.1.2 版本起可用。
> 该功能自 2.1.1 版本起可用。

使用 INSERT OVERWRITE 重写分区时，实际我们是将如下三步操作封装为一个事务并执行，如果中途失败，已进行的操作将会回滚：
1. 假设指定重写分区 p1，首先创建一个与重写的目标分区结构相同的空临时分区 `pTMP`
Expand Down
28 changes: 18 additions & 10 deletions versioned_docs/version-2.1/advanced/partition/auto-partition.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -185,7 +185,9 @@ mysql> select * from auto_null_list partition(pX);
1 row in set (0.20 sec)
```

2. In Doris, NULL values are included in the minimum value partition, whether they are AUTO PARTITION tables or not. Therefore, if a partition is automatically created for a NULL value, you get a partition starting with the minimum value:
2. For AUTO RANGE PARTITION, the storage of NULL values requires the manual creation of specific partitions.

In Doris' RANGE PARTITION, we do not use a separate NULL PARTITION to contain NULL values, but rather group them in the **minium LESS THAN partition**. For logical clarity, the AUTO RANGE PARTITION does not automatically create such a partition when it encounters a NULL value. If necessary, you can create such a partition yourself to contain NULL values.

```sql
mysql> CREATE TABLE `range_table_nullable` (
Expand All @@ -204,15 +206,21 @@ mysql> CREATE TABLE `range_table_nullable` (
Query OK, 0 rows affected (0.09 sec)

mysql> insert into range_table_nullable values (0, null, null);
Query OK, 1 row affected (0.21 sec)

mysql> show partitions from range_table_nullable;
+-------------+-----------------+----------------+---------------------+--------+--------------+----------------------------------------------------------------------------------------------------------+-----------------+---------+----------------+---------------+---------------------+---------------------+--------------------------+----------+------------+-------------------------+-----------+--------------------+--------------+
| PartitionId | PartitionName | VisibleVersion | VisibleVersionTime | State | PartitionKey | Range | DistributionKey | Buckets | ReplicationNum | StorageMedium | CooldownTime | RemoteStoragePolicy | LastConsistencyCheckTime | DataSize | IsInMemory | ReplicaAllocation | IsMutable | SyncWithBaseTables | UnsyncTables |
+-------------+-----------------+----------------+---------------------+--------+--------------+----------------------------------------------------------------------------------------------------------+-----------------+---------+----------------+---------------+---------------------+---------------------+--------------------------+----------+------------+-------------------------+-----------+--------------------+--------------+
| 457060 | p00000101000000 | 2 | 2024-03-25 03:01:38 | NORMAL | k2 | [types: [DATETIMEV2]; keys: [0000-01-01 00:00:00]; ..types: [DATETIMEV2]; keys: [0000-01-02 00:00:00]; ) | k1 | 16 | 1 | HDD | 9999-12-31 23:59:59 | | NULL | 0.000 | false | tag.location.default: 1 | true | true | NULL |
+-------------+-----------------+----------------+---------------------+--------+--------------+----------------------------------------------------------------------------------------------------------+-----------------+---------+----------------+---------------+---------------------+---------------------+--------------------------+----------+------------+-------------------------+-----------+--------------------+--------------+
1 row in set (0.09 sec)
ERROR 1105 (HY000): errCode = 2, detailMessage = [CANCELLED]TStatus: errCode = 2, detailMessage = Can't create partition for NULL Range

mysql> alter table range_table_nullable add partition pX VALUES LESS THAN ("1970-01-01");
Query OK, 0 rows affected (0.11 sec)

mysql> insert into range_table_nullable values (0, null, null);
Query OK, 1 row affected (0.18 sec)

mysql> select * from range_table_nullable;
+------+------+------+
| k1 | k2 | k3 |
+------+------+------+
| 0 | NULL | NULL |
+------+------+------+
1 row in set (0.18 sec)
```

## Sample Scenarios
Expand Down
2 changes: 1 addition & 1 deletion ...ual/sql-reference/Data-Manipulation-Statements/Manipulation/INSERT-OVERWRITE.md
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Original file line number Diff line number Diff line change
Expand Up @@ -188,7 +188,7 @@ The following is examples:

#### Overwrite Auto Detect Partition

> This feature is available since version 2.1.2.
> This feature is available since version 2.1.1.

When the PARTITION clause specified by the INSERT OVERWRITE command is `PARTITION(*)`, this overwrite will automatically detect the partition where the data is located. Example:

Expand Down