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Avoid permission failure in pg_sequences.last_value

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Before, reading pg_sequences.last_value would fail unless the user had
appropriate sequence permissions, which would make the pg_sequences view
cumbersome to use.  Instead, return null instead of the real value when
there are no permissions.

From: Michael Paquier <michael.paquier@gmail.com>
Reported-by: Shinoda, Noriyoshi <noriyoshi.shinoda@hpe.com>
This commit is contained in:
Peter Eisentraut
2017-02-06 15:17:27 -05:00
parent ad6af3fc42
commit ab82340a43
3 changed files with 13 additions and 3 deletions
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6
src/backend/catalog/system_views.sql
View File

@ -175,7 +175,11 @@ CREATE OR REPLACE VIEW pg_sequences AS
S.seqincrement AS increment_by,
S.seqcycle AS cycle,
S.seqcache AS cache_size,
pg_sequence_last_value(C.oid) AS last_value
CASE
WHEN has_sequence_privilege(C.oid, 'SELECT,USAGE'::text)
THEN pg_sequence_last_value(C.oid)
ELSE NULL
END AS last_value
FROM pg_sequence S JOIN pg_class C ON (C.oid = S.seqrelid)
LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
WHERE NOT pg_is_other_temp_schema(N.oid)

5
src/test/regress/expected/rules.out
View File

@ -1647,7 +1647,10 @@ pg_sequences| SELECT n.nspname AS schemaname,
s.seqincrement AS increment_by,
s.seqcycle AS cycle,
s.seqcache AS cache_size,
pg_sequence_last_value((c.oid)::regclass) AS last_value
CASE
WHEN has_sequence_privilege(c.oid, 'SELECT,USAGE'::text) THEN pg_sequence_last_value((c.oid)::regclass)
ELSE NULL::bigint
END AS last_value
FROM ((pg_sequence s
JOIN pg_class c ON ((c.oid = s.seqrelid)))
LEFT JOIN pg_namespace n ON ((n.oid = c.relnamespace)))