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For a very long time, one of the parser's heuristics for resolving ambiguous operator calls has been to assume that unknown-type literals are of the same type as the other input (if it's known). However, this was only used in the first step of quickly checking for an exact-types match, and thus did not help in resolving matches that require coercion, such as matches to polymorphic operators. As we add more polymorphic operators, this becomes more of a problem. This patch adds another use of the same heuristic as a last-ditch check before failing to resolve an ambiguous operator or function call. In particular this will let us define the range inclusion operator in a less limited way (to come in a follow-on patch). |
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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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.