52.51. 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 52.51.
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 3
would
mean that the first and the third table columns are covered

stxkind

char[]

An array containing codes for the enabled statistic kinds;
valid values are:
d
for ndistinct statistics,
f
for functional dependency statistics


stxndistinct

pg_ndistinct

Ndistinct counts, serialized as
pg_ndistinct
type


stxdependencies

pg_dependencies

Functional dependency statistics, serialized
as
pg_dependencies
type

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
.