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split_pathtarget_at_srfs() neglected to worry about sortgroupref labels in the intermediate PathTargets it constructs. I think we'd supposed that their labeling didn't matter, but it does at least for the case that GroupAggregate/GatherMerge nodes appear immediately under the ProjectSet step(s). This results in "ERROR: ORDER/GROUP BY expression not found in targetlist" during create_plan(), as reported by Rajkumar Raghuwanshi. To fix, make this logic track the sortgroupref labeling of expressions, not just their contents. This also restores the pre-v10 behavior that separate GROUP BY expressions will be kept distinct even if they are textually equal(). Discussion: https://postgr.es/m/CAKcux6=1_Ye9kx8YLBPmJs_xE72PPc6vNi5q2AOHowMaCWjJ2w@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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.