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The previous coding would report that an array type supports extended hashing if its element type supports regular hashing. This bug is only latent at the moment, since AFAICS there is not yet any code that depends on checking presence of extended-hashing support to make any decisions. (And in any case it wouldn't matter unless the element type has only regular hashing, which isn't true of any core data type.) But that doesn't make it less broken. Extend the cache_array_element_properties infrastructure to check this properly.
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/.