51.52. pg_statistic_ext_data

51.52. `pg_statistic_ext_data`
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## 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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