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Michael Paquier 17caf66445 psql: Add \sendpipeline to send query buffers while in a pipeline 
In the initial pipeline support for psql added in 41625ab8ea, \g was
used as the way to push extended query into an ongoing pipeline.  \gx
was blocked.

These two meta-commands have format-related options that can be applied
when fetching a query result (expanded, etc.).  As the results of a
pipeline are fetched asynchronously, not at the moment of the
meta-command execution but at the moment of a \getresults or a
\endpipeline, authorizing \g while blocking \gx leads to a confusing
implementation, making one think that psql should be smart enough to
remember the output format options defined from the time when \g or \gx
were executed.  Doing so would lead to more code complications when
retrieving a batch of results.  There is an extra argument other than
simplicity here: the output format options defined at the point of a
\getresults or a \endpipeline execution should be what affect the output
format for a batch of results.

To avoid any confusion, we have settled to the introduction of a new
meta-command called \sendpipeline, replacing \g when within a pipeline.
An advantage of this design is that it is possible to add new options
specific to pipelines when sending a query buffer, independent of \g
and \gx, should it prove to be necessary.

Most of the changes of this commit happen in the regression tests, where
\g is replaced by \sendpipeline.  More tests are added to check that \g
is not allowed.

Per discussion between the author, Daniel Vérité and me.

Author: Anthonin Bonnefoy <anthonin.bonnefoy@datadoghq.com>
Discussion: https://postgr.es/m/ad4b9f1a-f7fe-4ab8-8546-90754726d0be@manitou-mail.org
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README.md

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/.