## # 52.51. `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 52.51. pg_statistic_ext_data Columns**

Column Type Description |
---|

`stxoid` `oid` (references `pg_statistic_ext` .`oid` )Extended statistics 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 |

`stxdexpr` `pg_statistic[]` Per-expression statistics, serialized as an array of `pg_statistic` type |