51.52. 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 | pg_statistic_ext.oid | Extended statistic object containing the definition for this data |
stxdndistinct | pg_ndistinct | N-distinct counts, serialized as pg_ndistinct type | |
stxddependencies | pg_dependencies | Functional dependency statistics, serialized as pg_dependencies type | |
stxdmcv | pg_mcv_list | MCV (most-common values) list statistics, serialized as pg_mcv_list type |
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https://www.postgresql.org/docs/12/catalog-pg-statistic-ext-data.html