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Remove the code that supported zipfian distribution parameters less than 1.0, as it had undocumented performance hazards, and it's not clear that the case is useful enough to justify either fixing or documenting those hazards. Also, since the code path for parameter > 1.0 could perform badly for values very close to 1.0, establish a minimum allowed value of 1.001. This solution seems superior to the previous vague documentation warning about small values not performing well. Fabien Coelho, per a gripe from Tomas Vondra Discussion: https://postgr.es/m/b5e172e9-ad22-48a3-86a3-589afa20e8f7@2ndquadrant.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: 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/.