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The tsvector data type has always forbidden lexemes to be empty. However, array_to_tsvector() didn't get that memo, and would allow an empty-string array element to become an empty lexeme. This could result in dump/restore failures later, not to mention whatever semantic issues might be behind the original prohibition. However, other functions that take a plain text input directly as a lexeme value do not need a similar restriction, because they only match the string against existing tsvector entries. In particular it'd be a bad idea to make ts_delete() reject empty strings, since that is the most convenient way to clean up any bad data that might have gotten into a tsvector column via this bug. Reflecting on that, let's also remove the prohibition against NULL array elements in tsvector_delete_arr and tsvector_setweight_by_filter. It seems more consistent to ignore them, as an empty-string element would be ignored. There's a case for back-patching this, since it's clearly a bug fix. On balance though, it doesn't seem like something to change in a minor release. Jean-Christophe Arnu Discussion: https://postgr.es/m/CAHZmTm1YVndPgUVRoag2WL0w900XcoiivDDj-gTTYBsG25c65A@mail.gmail.com |
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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: 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/.