pg_partitioned_table
The catalog pg_partitioned_table stores
information about how tables are partitioned.
Table 51.36. pg_partitioned_table Columns
| Name | Type | References | Description |
|---|---|---|---|
partrelid | oid | | The OID of the pg_class entry for this partitioned table |
partstrat | char |
Partitioning strategy; h = hash partitioned table,
l = list partitioned table, r = range partitioned table
| |
partnatts | int2 | The number of columns in partition key | |
partdefid | oid | |
The OID of the pg_class entry for the default partition
of this partitioned table, or zero if this partitioned table does not
have a default partition.
|
partattrs | int2vector | |
This is an array of partnatts values that
indicate which table columns are part of the partition key. For
example, a value of 1 3 would mean that the first
and the third table columns make up the partition key. A zero in this
array indicates that the corresponding partition key column is an
expression, rather than a simple column reference.
|
partclass | oidvector | |
For each column in the partition key, this contains the OID of the
operator class to use. See
pg_opclass for details.
|
partcollation | oidvector | | For each column in the partition key, this contains the OID of the collation to use for partitioning, or zero if the column is not of a collatable data type. |
partexprs | pg_node_tree |
Expression trees (in nodeToString()
representation) for partition key columns that are not simple column
references. This is a list with one element for each zero
entry in partattrs. Null if all partition key columns
are simple references.
|