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The initial catalog data for this function failed to set proretset or provide a prorows estimate. It accidentally worked anyway when invoked in the FROM clause, because the executor isn't too picky about this; but the planner didn't expect the function to return multiple rows, which could lead to bad plans. Also the function would fail if invoked in the SELECT list. We can't easily back-patch this fix, but fortunately the bug's consequences aren't awful in most cases. Getting this right is mainly an exercise in future-proofing. Discussion: https://postgr.es/m/1636062.1615141782@sss.pgh.pa.us |
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| README.git | ||
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/.