2604438472
The distance of a removed phrase operator should propagate up to a parent phrase operator if there is one, but this only worked correctly in left-deep trees. Throwing in a few parentheses confused it completely, as indeed was illustrated by bizarre results in existing regression test cases. To fix, track unaccounted-for distances that should propagate to the left and to the right of the current node, rather than trying to make it work with only one returned distance. Also make some adjustments to behave as well as we can for cases of intermixed phrase and regular (AND/OR) operators. I don't think it's possible to be 100% correct for that without a rethinking of the tsquery representation; for example, maybe we should just not drop stopword nodes at all underneath phrase operators. But this is better than it was, and changing tsquery representation wouldn't be safely back-patchable. While at it, I simplified the API of the clean_fakeval_intree function a bit by getting rid of the "char *result" output parameter; that wasn't doing anything that wasn't redundant with whether the result node is NULL or not, and testing for NULL seems a lot clearer/safer. This is part of a larger project to fix various infelicities in the phrase-search implementation, but this part seems comittable on its own. Back-patch to 9.6 where phrase operators were introduced. Discussion: https://postgr.es/m/28215.1481999808@sss.pgh.pa.us Discussion: https://postgr.es/m/26706.1482087250@sss.pgh.pa.us |
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README
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/.