The gp_distribution_policy table contains information about HAWQ tables and their policy for distributing table data across the segments. This table is populated only on the master. This table is not globally shared, meaning each database has its own copy of this table.

Table 1. pg_catalog.gp_distribution_policy

column type references description
localoid oid pg_class.oid The table object identifier (OID).
attrnums smallint[] pg_attribute.attnum The column number(s) of the distribution column(s).
bucketnum integer   Number of hash buckets used in creating a hash-distributed table or for external table intermediate processing. The number of buckets also affects how many virtual segment are created when processing data.