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The check for the number of roles in the target cluster for an upgrade selects the existing roles and performs a COUNT(*) over the result. A value of one is the expected query result value indicating that only the install user is present in the new cluster. The result was converted with the function for converting a string containing an Oid into a numeric, which avoids potential overflow but makes the code less readable since it's not actually an Oid at all. Discussion: https://postgr.es/m/41AB5F1F-4389-4B25-9668-5C430375836C@yesql.se |
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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/.