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Tom Lane 5a617d75d3 Fix ts_headline() to handle ORs and phrase queries more honestly. 
This patch largely reverts what I did in commits c9b0c678d and
78e73e875.  The maximum cover length limit that I added in 78e73e875
(to band-aid over c9b0c678d's performance issues) creates too many
user-visible behavior discrepancies, as complained of for example in
bug #17691.  The real problem with hlCover() is not what I thought
at the time, but more that it seems to have been designed with only
AND tsquery semantics in mind.  It doesn't work quite right for OR,
and even less so for NOT or phrase queries.  However, we can improve
that situation by building a variant of TS_execute() that returns a
list of match locations.  We already get an ExecPhraseData struct
representing match locations for the primitive case of a simple match,
as well as one for a phrase match; we just need to add some logic to
combine these for AND and OR operators.  The result is a list of
ExecPhraseDatas, which hlCover can regard as having simple AND
semantics, so that its old algorithm works correctly.

There's still a lot not to like about ts_headline's behavior, but
I think the remaining issues have to do with the heuristics used
in mark_hl_words and mark_hl_fragments (which, likewise, were not
revisited when phrase search was added).  Improving those is a task
for another day.

Patch by me; thanks to Alvaro Herrera for review.

Discussion: https://postgr.es/m/840.1669405935@sss.pgh.pa.us
 		2023-01-19 16:21:44 -05:00
config autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
contrib Get rid of the "new" and "old" entries in a view's rangetable. 2023-01-18 13:23:57 -05:00
doc doc: Fix some issues in logical replication section 2023-01-19 14:00:23 +09:00
src Fix ts_headline() to handle ORs and phrase queries more honestly. 2023-01-19 16:21:44 -05:00
.cirrus.yml Fix typos in comments, code and documentation 2023-01-03 16:26:14 +09:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
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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:

	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/.