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Its results vary depending on the IntervalStyle GUC, so it cannot be considered immutable. This is an extremely ancient bug. AFAICT it was a sloppy mistake in 6f58115dd, which marked it "cacheable" alongside marking several other interval functions that way. At the time, interval_out() depended on DateStyle not IntervalStyle, but it was still wrong. Back-patching this change doesn't look very practical, so I won't. Aside from the usual difficulties of getting catalog changes applied to existing databases, people might have indexes, generated columns, etc that depend on interval-to-text casts being considered immutable. (This'd not really give them any problem as long as they never change IntervalStyle.) They wouldn't appreciate us breaking such usage in minor releases. Per bug #17371 from Marcus Gartner. Discussion: https://postgr.es/m/17371-8f57e6e9ca5e35bf@postgresql.org
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/.