-- Install the extension, in a non default schema that requires quoting to
-- ensure that custom schema works as expected.
CREATE SCHEMA "PGQS";
CREATE EXTENSION pg_qualstats WITH SCHEMA "PGQS";
-- based on upstream function of the same name
CREATE FUNCTION explain_filter(text) RETURNS SETOF text
LANGUAGE plpgsql as
$$
DECLARE
    ln text;
BEGIN
    FOR ln IN EXECUTE $1
    LOOP
        -- Replace any numeric word with just 'N'
        ln := regexp_replace(ln, '-?\m\d+\M', 'N', 'g');
        -- In sort output, the above won't match units-suffixed numbers
        ln := regexp_replace(ln, '\m\d+kB', 'NkB', 'g');
        -- Ignore text-mode buffers output because it varies depending
        -- on the system state
        CONTINUE WHEN (ln ~ ' +Buffers: .*');
        -- Ignore text-mode "Planning:" line because whether it's output
        -- varies depending on the system state
        CONTINUE WHEN (ln = 'Planning:');
        -- Remove the "expr_" name prefix in subplans names, added in pg19
        ln := regexp_replace(ln, 'SubPlan expr_\d+', 'SubPlan N', 'g');
        RETURN NEXT ln;
    END LOOP;
END;
$$;