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
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