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Previously, the code used a node label of zero both for strings that contain no bytes beyond the inner tuple's prefix, and for cases where an "allTheSame" inner tuple has to be split to allow a string with a different next byte to be inserted into it. Failing to distinguish these cases meant that if a string ending with the current prefix needed to be inserted into an allTheSame tuple, we got into an infinite loop, because after splitting the tuple we'd descend into the child allTheSame tuple and then find we need to split again. To fix, instead use -1 and -2 as the node labels for these two cases. This requires widening the node label type from "char" to int2, but fortunately SPGiST stores all pass-by-value node label types in their Datum representation, which means that this change is transparently upward compatible so far as the on-disk representation goes. We continue to recognize zero as a dummy node label for reading purposes, but will not attempt to push new index entries down into such a label, so that the loop won't occur even when dealing with an existing index. Per report from Teodor Sigaev. Back-patch to 9.2 where the faulty code was introduced. |
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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. 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/.