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Dean Rasheed 33e729c514 Fix EXPLAIN output for subplans in MERGE.
Given a subplan in a MERGE query, EXPLAIN would sometimes fail to
properly display expressions involving Params referencing variables in
other parts of the plan tree.

This would affect subplans outside the topmost join plan node, for
which expansion of Params would go via the top-level ModifyTable plan
node.  The problem was that "inner_tlist" for the ModifyTable node's
deparse_namespace was set to the join node's targetlist, but
"inner_plan" was set to the ModifyTable node itself, rather than the
join node, leading to incorrect results when descending to the
referenced variable.

Fix and backpatch to v15, where MERGE was introduced.

Discussion: https://postgr.es/m/CAEZATCWAv-sZuH%2BwG5xJ-%2BGt7qGNGX8wUQd3XYydMFDKgRB9nw%40mail.gmail.com
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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/.