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This makes the choice of result scale of numeric power() for integer exponents consistent with the choice for non-integer exponents, and with the result scale of other numeric functions. Specifically, the result scale will be at least as large as the scale of either input, and sufficient to ensure that the result has at least 16 significant digits. Formerly, the result scale was based only on the scale of the first input, without taking into account the weight of the result. For results with negative weight, that could lead to results with very few or even no non-zero significant digits (e.g., 10.0 ^ (-18) produced 0.0000000000000000). Fix this by moving responsibility for the choice of result scale into power_var_int(), which already has code to estimate the result weight. Per report by Adrian Klaver and suggested fix by Tom Lane. No back-patch -- arguably this is a bug fix, but one which is easy to work around, so it doesn't seem worth the risk of changing query results in stable branches. Discussion: https://postgr.es/m/12a40226-70ac-3a3b-3d3a-fdaf9e32d312%40aklaver.com |
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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: 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/.