From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | pgsql-committers(at)lists(dot)postgresql(dot)org |
Subject: | pgsql: Disallow making an empty lexeme via array_to_tsvector(). |
Date: | 2021-11-06 17:29:02 |
Message-ID: | E1mjPV0-0000qX-H9@gemulon.postgresql.org |
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Lists: | pgsql-committers |
Disallow making an empty lexeme via array_to_tsvector().
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
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/cbe25dcff73a297adbada9dc1d6cad3df18014e9
Modified Files
--------------
doc/src/sgml/func.sgml | 14 ++++++++++++--
src/backend/utils/adt/tsvector_op.c | 20 +++++++++++++-------
src/test/regress/expected/tstypes.out | 19 ++++++++++++++-----
src/test/regress/sql/tstypes.sql | 8 +++++---
4 files changed, 44 insertions(+), 17 deletions(-)
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