519fc1bd9e
This adds support for infinity to the interval data type, using the same input/output representation as the other date/time data types that support infinity. This allows various arithmetic operations on infinite dates, timestamps and intervals. The new values are represented by setting all fields of the interval to INT32/64_MIN for -infinity, and INT32/64_MAX for +infinity. This ensures that they compare as less/greater than all other interval values, without the need for any special-case comparison code. Note that, since those 2 values were formerly accepted as legal finite intervals, pg_upgrade and dump/restore from an old database will turn them from finite to infinite intervals. That seems OK, since those exact values should be extremely rare in practice, and they are outside the documented range supported by the interval type, which gives us a certain amount of leeway. Bump catalog version. Joseph Koshakow, Jian He, and Ashutosh Bapat, reviewed by me. Discussion: https://postgr.es/m/CAAvxfHea4%2BsPybKK7agDYOMo9N-Z3J6ZXf3BOM79pFsFNcRjwA%40mail.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. 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, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.