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json_agg and json_object_agg and their associated transition functions should have been marked as stable rather than immutable, as they call IO functions indirectly. Changing this probably isn't going to make much difference, as you can't use an aggregate function in an index expression, but we should be correct nevertheless. json_object, on the other hand, should be marked immutable rather than stable, as it does not call IO functions. As discussed on -hackers, this change is being made without bumping the catalog version, as we don't want to do that at this stage of the cycle, and the changes are very unlikely to affect anyone.
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.