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.
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 those tables and columns that are readable by the
current user.
Table 51.52. pg_statistic_ext_data
Columns
Name  Type  References  Description 

stxoid  oid 
 Extended statistic object containing the definition for this data 
stxdndistinct  pg_ndistinct 
Ndistinct counts, serialized as pg_ndistinct type
 
stxddependencies  pg_dependencies 
Functional dependency statistics, serialized
as pg_dependencies type
 
stxdmcv  pg_mcv_list 
MCV (mostcommon values) list statistics, serialized as
pg_mcv_list type
