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Multi-dimensional arrays can now be used as arguments to a PL/python function (used to throw an error), and they can be returned as nested Python lists. This makes a backwards-incompatible change to the handling of composite types in arrays. Previously, you could return an array of composite types as "[[col1, col2], [col1, col2]]", but now that is interpreted as a two- dimensional array. Composite types in arrays must now be returned as Python tuples, not lists, to resolve the ambiguity. I.e. "[(col1, col2), (col1, col2)]". To avoid breaking backwards-compatibility, when not necessary, () is still accepted for arrays at the top-level, but it is always treated as a single-dimensional array. Likewise, [] is still accepted for composite types, when they are not in an array. Update the documentation to recommend using [] for arrays, and () for composite types, with a mention that those other things are also accepted in some contexts. This needs to be mentioned in the release notes. Alexey Grishchenko, Dave Cramer and me. Reviewed by Pavel Stehule. Discussion: <CAH38_tmbqwaUyKs9yagyRra=SMaT45FPBxk1pmTYcM0TyXGG7Q@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: 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/.