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Add sequence USAGE privileges to information schema

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The sequence USAGE privilege is sufficiently similar to the SQL
standard that it seems reasonable to show in the information schema.
Also add some compatibility notes about it on the GRANT reference
page.
This commit is contained in:
Peter Eisentraut
2012-01-30 21:45:42 +02:00
parent ee7fa66b19
commit 82e83f46a2
3 changed files with 59 additions and 3 deletions
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12
doc/src/sgml/ref/grant.sgml
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@@ -642,6 +642,18 @@ GRANT admins TO joe;
translations.
</para>
<para>
In the SQL standard, sequences only have a <literal>USAGE</literal>
privilege, which controls the use of the <literal>NEXT VALUE FOR</literal>
expression, which is equivalent to the
function <function>nextval</function> in PostgreSQL. The sequence
privileges <literal>SELECT</literal> and <literal>UPDATE</literal> are
PostgreSQL extensions. The application of the
sequence <literal>USAGE</literal> privilege to
the <literal>currval</literal> function is also a PostgreSQL extension (as
is the function itself).
</para>
<para>
Privileges on databases, tablespaces, schemas, and languages are
<productname>PostgreSQL</productname> extensions.