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getBlobs' queries for pre-9.0 servers were broken in two ways: the 7.x/8.x query uses DISTINCT so it can't have unspecified-type NULLs in the target list, and both that query and the 7.0 one failed to provide the correct output column labels, so that the subsequent code to extract data from the PGresult would fail. Back-patch to 9.6 where the breakage was introduced (by commit 23f34fa4b). Amit Langote and Tom Lane Discussion: <0a3e7a0e-37bd-8427-29bd-958135862f0a@lab.ntt.co.jp>
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. 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/.