PostgreSQL
51.51. 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 51.51. pg_statistic_ext_data Columns
| Column Type Description |
|---|
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 |
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