The catalog pg_statistic_ext holds definitions of extended planner statistics. Each row in this catalog corresponds to a statistics object created with CREATE STATISTICS.
Table 51.52. pg_statistic_ext Columns
Column Type Description |
---|
Row identifier |
Table containing the columns described by this object |
Name of the statistics object |
The OID of the namespace that contains this statistics object |
Owner of the statistics object |
An array of attribute numbers, indicating which table columns are
covered by this statistics object;
for example a value of |
|
An array containing codes for the enabled statistics kinds;
valid values are:
|
Expression trees (in |
The pg_statistic_ext entry is filled in completely during CREATE STATISTICS, but the actual statistical values are not computed then. Subsequent ANALYZE commands compute the desired values and populate an entry in the pg_statistic_ext_data catalog.