INFORMATION_SCHEMA.PARTITION_POLICY_PARTITIONS is used to query PARTITION POLICY rules in the system. INFORMATION_SCHEMA.PARITTION_POLICIES and INFORMATION_SCHEMA.PARTITION_POLICY_PARTITIONS form the definition of PARTITION POLICY rules, similar to INFORMATION_SCHEMA.TABLES and INFORMATION_SCHEMA.PARTITIONS.Field Name | Type | Description |
PARTITION_POLICY_ID | BIGINT UNSIGNED | the unique ID of PARTITION POLICY. |
PARTITION_POLICY_NAME | VARCHAR(64) | the unique NAME of PARTITION POLICY. |
PARTITION_ID | BIGINT UNSIGNED | Each partition of a PARTITION POLICY has a unique ID. |
PARTITION_NAME | VARCHAR(64) | Partition NAME. |
SUBPARTITION_NAME | VARCHAR(64) | Sub-partition NAME. |
PARTITION_ORDINAL_POSITION | INT UNSIGNED | Partition position: the ordinal position of the partition in the table. |
SUBPARTITION_ORDINAL_POSITION | INT UNSIGNED | Sub-partition position: the ordinal position of the sub-partition within the partition. |
PARTITION_METHOD | VARCHAR(13) | Partition types, common ones include: RANGE, LIST, HASH, KEY. |
SUBPARTITION_METHOD | VARCHAR(13) | Sub-partition type. |
PARTITION_EXPRESSION | VARCHAR(2048) | The expression of the partition function used in the CREATE TABLE or ALTER TABLE statements for the current partition scheme. |
SUBPARTITION_EXPRESSION | VARCHAR(2048) | Subpartition expression, defined in the same way as PARTITION_EXPRESSION. |
PARTITION_DESCRIPTION | TEXT | The value rules describing partitions for RANGE and LIST partitioning. RANGE partitions: contain the values specified in the VALUES LESS THAN clause. The value can be an integer or MAXVALUE.LIST partitions: contain the values defined in the VALUES IN clause, which is a comma-separated list of integer values.Other partition types: For partitioning methods other than RANGE and LIST, the PARTITION_DESCRIPTION field is always NULL. |
HIDDEN | ENUM | Explicit: user-explicitly created PARTITION policies. Implicit: database-automatically created implicit PARTITION policies. |
SE_PRIVATE_DATA | MEDIUMTEXT | Reserved fields. |
tdsql> SELECT * FROM information_schema.partition_policy_partitions;+---------------------+-----------------------+--------------+----------------+-------------------+----------------------------+-------------------------------+------------------+---------------------+----------------------+-------------------------+-----------------------+----------+---------------------------+| PARTITION_POLICY_ID | PARTITION_POLICY_NAME | PARTITION_ID | PARTITION_NAME | SUBPARTITION_NAME | PARTITION_ORDINAL_POSITION | SUBPARTITION_ORDINAL_POSITION | PARTITION_METHOD | SUBPARTITION_METHOD | PARTITION_EXPRESSION | SUBPARTITION_EXPRESSION | PARTITION_DESCRIPTION | HIDDEN | SE_PRIVATE_DATA |+---------------------+-----------------------+--------------+----------------+-------------------+----------------------------+-------------------------------+------------------+---------------------+----------------------+-------------------------+-----------------------+----------+---------------------------+| 1 | impl_pp_hash_4 | 1 | p0 | NULL | 1 | NULL | HASH | NULL | INTEGER | NULL | NULL | Implicit | distribution_policy_id=0; || 1 | impl_pp_hash_4 | 2 | p1 | NULL | 2 | NULL | HASH | NULL | INTEGER | NULL | NULL | Implicit | distribution_policy_id=0; || 1 | impl_pp_hash_4 | 3 | p2 | NULL | 3 | NULL | HASH | NULL | INTEGER | NULL | NULL | Implicit | distribution_policy_id=0; || 1 | impl_pp_hash_4 | 4 | p3 | NULL | 4 | NULL | HASH | NULL | INTEGER | NULL | NULL | Implicit | distribution_policy_id=0; |+---------------------+-----------------------+--------------+----------------+-------------------+----------------------------+-------------------------------+------------------+---------------------+----------------------+-------------------------+-----------------------+----------+---------------------------+4 rows in set (0.02 sec)
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