pg_statistic_ext_data system catalog table 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.
||oid||pg_statistic_ext.oid||The extended statistic object containing the definition for this data.|
||pg_ndistinct||N-distinct counts, serialized as
||pg_dependencies||Functional dependency statistics, serialized as
||pg_mcv_list||MCV (most-common values) list statistics, serialized as
Parent topic: System Catalogs Definitions