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transformPartitionSpec rejected duplicate simple partition columns (e.g., "PARTITION BY RANGE (x,x)") but paid no attention to expression columns, resulting in inconsistent behavior. Worse, cases like "PARTITION BY RANGE (x,(x))") were accepted but would then result in dump/reload failures, since the expression (x) would get simplified to a plain column later. There seems no better reason for this restriction than there was for the one against duplicate included index columns (cf commit 701fd0bbc), so let's just remove it. Back-patch to v10 where this code was added. Report and patch by Yugo Nagata. Discussion: https://postgr.es/m/20180712165939.36b12aff.nagata@sraoss.co.jp
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/.