Re: Extended Statistics set/restore/clear functions. - Mailing list pgsql-hackers

On Tue, Nov 11, 2025 at 4:07 PM Michael Paquier <michael@paquier.xyz> wrote:
> I've rebased the full set using the new structure.  0001~0004 are
> clean.  0005~ need more work and analysis, but that's a start.
hi.

diff --git a/doc/src/sgml/perform.sgml b/doc/src/sgml/perform.sgml
index 106583fb2965..e0e9f0468cb8 100644
--- a/doc/src/sgml/perform.sgml
+++ b/doc/src/sgml/perform.sgml
@@ -1579,9 +1579,39 @@ ANALYZE zipcodes;
 SELECT stxkeys AS k, stxdndistinct AS nd
   FROM pg_statistic_ext join pg_statistic_ext_data on (oid = stxoid)
   WHERE stxname = 'stts2';
--[ RECORD 1 ]------------------------------------------------------&zwsp;--
+-[ RECORD 1 ]-------------------
 k  | 1 2 5
-nd | {"1, 2": 33178, "1, 5": 33178, "2, 5": 27435, "1, 2, 5": 33178}
+nd | [                          +
+   |     {                      +
+   |         "ndistinct": 33178,+
+   |         "attributes": [    +
+   |             1,             +
+   |             2              +
+   |         ]                  +
+   |     },                     +

If you not specify as
 SELECT stxkeys AS k, stxdndistinct AS nd
   FROM pg_statistic_ext join pg_statistic_ext_data on (oid = stxoid)
   WHERE stxname = 'stts2' \gx
then it won't look like ``-[ RECORD 1 ]``.

I tried the dummy data, the above query, the nd column data look like

[{"attributes": [1, 2], "ndistinct": 2} .....
which does not look like the above.

So I guess the query in doc/src/sgml/perform.sgml would be:

SELECT stxkeys AS k, jsonb_pretty(d.stxdndistinct::text::jsonb) AS nd
FROM pg_statistic_ext join pg_statistic_ext_data d on (oid = d.stxoid)
WHERE stxname = 'stts2' \gx

per related thread, the word "join" needs uppercase?


--
jian
https://www.enterprisedb.com/