pg_statistic_ext_data #
   The catalog pg_statistic_ext_data
   holds data for extended planner statistics defined in
   pg_statistic_ext.
   Each row in this catalog corresponds to a statistics object
   created with CREATE STATISTICS.
  
   Normally there is one entry, with stxdinherit =
   false, for each statistics object that has been analyzed.
   If the table has inheritance children or partitions, a second entry with
   stxdinherit = true is also created.
   This row represents the statistics object over the inheritance tree, i.e.,
   statistics for the data you'd see with
   SELECT * FROM ,
   whereas the table*stxdinherit = false row
   represents the results of
   SELECT * FROM ONLY .
  table
   Like pg_statistic,
   pg_statistic_ext_data should not be
   readable by the public, since the contents might be considered sensitive.
   (Example: most common combinations of values in columns might be quite
   interesting.)
   pg_stats_ext
   is a publicly readable view
   on pg_statistic_ext_data (after joining
   with pg_statistic_ext) that only exposes
   information about tables the current user owns.
  
Table 51.53. pg_statistic_ext_data Columns
| Column Type Description | 
|---|
| 
        Extended statistics object containing the definition for this data | 
| 
        If true, the stats include values from child tables, not just the values in the specified relation | 
| 
        
       N-distinct counts, serialized as  | 
| 
        
       Functional dependency statistics, serialized
       as  | 
| 
        
       MCV (most-common values) list statistics, serialized as
        | 
| 
        
       Per-expression statistics, serialized as an array of
        |