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Coverity complained about this code's practice of using scalar variables as single-element arrays. While that's really just nitpicking, it probably is more readable to declare them as arrays, so let's do that. A more important point is that the code was just blithely assuming that the result tupledesc has exactly one column; if it doesn't, we'd likely get a crash of some sort in tuplestore_putvalues. Since the tupledesc is manufactured outside of plperl, that seems like an uncomfortably long chain of assumptions. We can nail it down at little cost with a sanity check earlier in the function.
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/.