Re: [BUG] false positive in bt_index_check in case of short 4B varlena datum

On Wed, Jan 10, 2024 at 1:59 AM Michael Zhilin <m(dot)zhilin(at)postgrespro(dot)ru> wrote:
>
> Hi,
>
> Thank you, Andrey, for review and advice!
>
> Here is rebased version (v2) of patch supposed to make CF bot happy.

Hi

+--
+-- BUG: must support different header size of short varlena datum
+--
+
+CREATE TABLE varlena_bug (v text);
+ALTER TABLE varlena_bug ALTER column v SET storage plain;
+INSERT INTO varlena_bug VALUES ('x');
+\set filename :abs_builddir '/results/varlena_bug.dmp'
+COPY varlena_bug TO :'filename';
+COPY varlena_bug FROM :'filename';
+CREATE INDEX varlena_bug_idx on varlena_bug(v);
+SELECT bt_index_check('varlena_bug_idx', true);

you can simply replace
+\set filename :abs_builddir '/results/varlena_bug.dmp'
+COPY varlena_bug TO :'filename';
+COPY varlena_bug FROM :'filename';

with

COPY varlena_bug from stdin;
x
\.

In the comments, adding the postgres link
(https://postgr.es/m/7bdbe559-d61a-4ae4-a6e1-48abdf3024cc@postgrespro.ru)
would be great.