51.51. pg_statistic_ext_data
The catalogpg_statistic_ext_data holds data for extended planner statistics defined inpg_statistic_ext. Each row in this catalog corresponds to astatistics object created withCREATE STATISTICS.
Likepg_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 onpg_statistic_ext_data (after joining withpg_statistic_ext) that only exposes information about those tables and columns that are readable by the current user.
Table 51.51. pg_statistic_ext_data Columns
Column Type Description |
|---|
Extended statistic object containing the definition for this data |
N-distinct counts, serialized as |
Functional dependency statistics, serialized as |
MCV (most-common values) list statistics, serialized as |