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.
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.
Extended statistic object containing the definition for this data
N-distinct counts, serialized as
Functional dependency statistics, serialized as
MCV (most-common values) list statistics, serialized as