PostgreSQL provides a function to inspect complex statistics defined using the
CREATE STATISTICS command.
pg_mcv_list_items returns a set of records describing all items stored in a multi-column MCV list. It returns the following columns:
||index of the item in the MCV list|
||values stored in the MCV item|
||frequency of this MCV item|
||base frequency of this MCV item|
pg_mcv_list_items function can be used like this:
SELECT m.* FROM pg_statistic_ext join pg_statistic_ext_data on (oid = stxoid), pg_mcv_list_items(stxdmcv) m WHERE stxname = 'stts';
Values of the
pg_mcv_list type can be obtained only from the
If you see anything in the documentation that is not correct, does not match your experience with the particular feature or requires further clarification, please use this form to report a documentation issue.