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If one exits and re-enters a DECLARE ... BEGIN ... END block within a single execution of a plpgsql function, perhaps due to a surrounding loop, the declared variables are supposed to get re-initialized to null (or whatever their initializer is). But this failed to happen for variables of type "record", because while exec_stmt_block() expected such variables to be included in the block's initvarnos list, plpgsql_add_initdatums() only adds DTYPE_VAR variables to that list. This bug appears to have been there since the aboriginal addition of plpgsql to our tree. Fix by teaching plpgsql_add_initdatums() to include DTYPE_REC variables as well. (We don't need to consider other DTYPEs because they don't represent separately-stored values.) I failed to resist the temptation to make some nearby cosmetic adjustments, too. No back-patch, because there have not been field complaints, and it seems possible that somewhere out there someone has code depending on the incorrect behavior. In any case this change would have no impact on correctly-written code. Discussion: https://postgr.es/m/22994.1512800671@sss.pgh.pa.us |
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README.git |
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/.