51.37. `pg_partitioned_table`
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## 51.37. `pg_partitioned_table` #

The catalog `pg_partitioned_table` stores information about how tables are partitioned.

Table 51.37. `pg_partitioned_table` Columns

Column Type Description
`partrelid` `oid` (references `pg_class`.`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 the partition key
`partdefid` `oid` (references `pg_class`.`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` (references `pg_attribute`.`attnum`)

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` (references `pg_opclass`.`oid`) For each column in the partition key, this contains the OID of the operator class to use. See `pg_opclass` for details.
`partcollation` `oidvector` (references `pg_collation`.`oid`) 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.

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