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_classentry 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_classentry 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 partnattsvalues that
       indicate which table columns are part of the partition key.  For
       example, a value of1 3would 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_opclassfor 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 inpartattrs.  Null if all partition key columns
       are simple references. |