PG_HASHBUCKET

PG_HASHBUCKET records hash bucket information.

Table 1 PG_HASHBUCKET columns

Name	Type	Description
oid	oid	Row identifier (hidden attribute, which must be specified)
bucketid	oid	Hash value calculated for a bucket vector. The hash value can be used to accelerate the search for a bucket vector.
bucketcnt	integer	Number of shards
bucketmapsize	integer	Total number of shards on all DNs
bucketref	integer	Reserved column with 1 as its default value
bucketvector	oidvector_extend	Records all bucket IDs contained in the bucket information in this row. A unique index is created in this column. Tables with the same bucket ID share the PG_HASHBUCKET data in the same row.