52.51. `pg_statistic_ext_data`
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## 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 tables the current user owns.

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

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