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The four functions array_ref, array_set, array_get_slice, array_set_slice have traditionally declared their array inputs and results as being of type "ArrayType *". This is a lie, and has been since Berkeley days, because they actually also support "fixed-length array" types such as "name" and "point"; not to mention that the inputs could be toasted. These values should be declared Datum instead to avoid confusion. The current coding already risks possible misoptimization by compilers, and it'll get worse when "expanded" array representations become a valid alternative. However, there's a fair amount of code using array_ref and array_set with arrays that *are* known to be ArrayType structures, and there might be more such places in third-party code. Rather than cluttering those call sites with PointerGetDatum/DatumGetArrayTypeP cruft, what I did was to rename the existing functions to array_get_element/array_set_element, fix their signatures, then reincarnate array_ref/array_set as backwards compatibility wrappers. array_get_slice/array_set_slice have no such constituency in the core code, and probably not in third-party code either, so I just changed their APIs. |
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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: 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/.