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Fix contrib/ltree's subpath() with negative offset.

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subpath(ltree,offset,len) now correctly errors when given an offset
less than -n, where n is the number of labels in the given ltree.
There was a duplicate block of code that allowed an offset as low
as -2n.  The documentation says no such thing, so this must have
been a copy-and-paste error in the original ltree patch.

While here, avoid redundant calculation of "end" and write
LTREE_MAX_LEVELS rather than its hard-coded value.

Author: Marcus Gartner <m.a.gartner@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CAAUGV_SvBO9gWYbaejb9nhe-mS9FkNP4QADNTdM3wdRhvLobwA@mail.gmail.com
This commit is contained in:
Tom Lane
2025-11-01 13:25:42 -04:00
parent 2648eab377
commit ff8aba65d4
3 changed files with 6 additions and 11 deletions
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1
contrib/ltree/sql/ltree.sql
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@@ -34,6 +34,7 @@ SELECT subpath('Top.Child1.Child2',0,0);
SELECT subpath('Top.Child1.Child2',1,0);
SELECT subpath('Top.Child1.Child2',0);
SELECT subpath('Top.Child1.Child2',1);
SELECT subpath('Top.Child1.Child2',-4); -- error
SELECT index('1.2.3.4.5.6','1.2');