9dce6b5a42
We have been using NRM_SUBSET to process NestLoopParams in setrefs.c,
because Vars or PHVs in NestLoopParam expressions may previously have
had nullingrels that were just subsets of those in the Vars or PHVs
actually available from the outer side.
Since 66e9df9f6, identify_current_nestloop_params ensures that any
Vars or PHVs seen in a NestLoopParam expression have nullingrels that
include exactly the outer-join relids that appear in the outer side's
output and can null the respective Var or PHV. As noted in that
commit's message, we can now safely use NRM_EQUAL to process
NestLoopParams in setrefs.c.
This patch makes that change and removes the definition of NRM_SUBSET,
along with all remaining checks for it, since it is no longer used.
Author: Richard Guo <guofenglinux@gmail.com>
Discussion: https://postgr.es/m/CAMbWs482_DFHzQ079ZPp6c8UvmFdz3Jj+4K8tVRu9g2Bw34NPA@mail.gmail.com
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/.