Fujii Masao 031904048a doc: Clarify pg_get_sequence_data() privileges and NULL results
The documentation for pg_get_sequence_data() did not match the
function's behavior. It stated that either USAGE or SELECT privilege
was sufficient, but the function returns sequence data only when the
caller has SELECT privilege.

The documentation also did not explain that the function returns a row
containing all NULL values when sequence data cannot be returned, such
as when the sequence does not exist or the caller lacks the required
privilege.

Update the documentation to reflect the actual behavior, including the
required privilege and the result returned when sequence data is
unavailable.

Author: Fujii Masao <masao.fujii@gmail.com>
Reviewed-by: Tristan Partin <tristan@partin.io>
Discussion: https://postgr.es/m/CAHGQGwGNTaXnBKUV510_P1KwhdbHT+kgZ4zU5njBHy7nCqdhzg@mail.gmail.com
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PostgreSQL Database Management System

This directory contains the source code distribution of the PostgreSQL database management system.

PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.

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Mirror of the official PostgreSQL GIT repository. Note that this is just a *mirror* - we don't work with pull requests on github. To contribute, please see https://wiki.postgresql.org/wiki/Submitting_a_Patch
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