pg_statistic_ext   The catalog pg_statistic_ext
   holds extended planner statistics.
   Each row in this catalog corresponds to a statistics object
   created with CREATE STATISTICS.
  
Table 51.51. pg_statistic_ext Columns
| Name | Type | References | Description | 
|---|---|---|---|
| stxrelid | oid |  | Table containing the columns described by this object | 
| stxname | name | Name of the statistics object | |
| stxnamespace | oid |  | The OID of the namespace that contains this statistics object | 
| stxowner | oid |  | Owner of the statistics object | 
| stxkeys | int2vector |  | An array of attribute numbers, indicating which table columns are
       covered by this statistics object;
       for example a value of 1 3would
       mean that the first and the third table columns are covered | 
| stxkind | char[] | An array containing codes for the enabled statistics kinds;
        valid values are: dfor n-distinct statistics,ffor functional dependency statistics | |
| stxndistinct | pg_ndistinct | N-distinct counts, serialized as pg_ndistincttype | |
| stxdependencies | pg_dependencies | Functional dependency statistics, serialized
       as pg_dependenciestype | 
   The stxkind field is filled at creation of the
   statistics object, indicating which statistic type(s) are desired.
   The fields after it are initially NULL and are filled only when the
   corresponding statistic has been computed by ANALYZE.