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931bf3eb9b
After removal, the next_sibling pointer of a node was sometimes incorrectly left to point to another node in the heap, which meant that a node was sometimes linked twice into the heap. Surprisingly that didn't cause any crashes in my testing, but it was clearly wrong and could easily segfault in other scenarios. Also always keep the prev_or_parent pointer as NULL on the root node. That was not a correctness issue AFAICS, but let's be tidy. Add a debugging function, to dump the contents of a pairing heap as a string. It's #ifdef'd out, as it's not used for anything in any normal code, but it was highly useful in debugging this. Let's keep it handy for further reference.
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/.