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incorrect default value after altering an ADDed column from NOT NULL to NULL #12037

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wk989898 opened this issue Jan 24, 2025 · 0 comments · May be fixed by #12038
Open

incorrect default value after altering an ADDed column from NOT NULL to NULL #12037

wk989898 opened this issue Jan 24, 2025 · 0 comments · May be fixed by #12038
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affects-6.1 This bug affects the 6.1.x(LTS) versions. affects-6.5 This bug affects the 6.5.x(LTS) versions. affects-7.1 This bug affects the 7.1.x(LTS) versions. affects-7.5 This bug affects the 7.5.x(LTS) versions. affects-8.1 This bug affects the 8.1.x(LTS) versions. affects-8.5 This bug affects the 8.5.x(LTS) versions. area/ticdc Issues or PRs related to TiCDC. severity/moderate type/bug The issue is confirmed as a bug.

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@wk989898
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What did you do?

run sql

create table t1(
    id int primary key
);
alter table t1 add column col json not null;
alter table t1 modify column col json default null;
insert into t1(id) values(1);

What did you expect to see?

the default value of col should be null

What did you see instead?

the default value of col is string literal "null"

Versions of the cluster

Upstream TiDB cluster version (execute SELECT tidb_version(); in a MySQL client):

master

TiCDC version (execute cdc version):

master
@wk989898 wk989898 added area/ticdc Issues or PRs related to TiCDC. type/bug The issue is confirmed as a bug. affects-6.1 This bug affects the 6.1.x(LTS) versions. affects-6.5 This bug affects the 6.5.x(LTS) versions. affects-7.1 This bug affects the 7.1.x(LTS) versions. affects-7.5 This bug affects the 7.5.x(LTS) versions. affects-8.1 This bug affects the 8.1.x(LTS) versions. affects-8.5 This bug affects the 8.5.x(LTS) versions. severity/moderate labels Jan 24, 2025
@wk989898 wk989898 linked a pull request Jan 24, 2025 that will close this issue
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affects-6.1 This bug affects the 6.1.x(LTS) versions. affects-6.5 This bug affects the 6.5.x(LTS) versions. affects-7.1 This bug affects the 7.1.x(LTS) versions. affects-7.5 This bug affects the 7.5.x(LTS) versions. affects-8.1 This bug affects the 8.1.x(LTS) versions. affects-8.5 This bug affects the 8.5.x(LTS) versions. area/ticdc Issues or PRs related to TiCDC. severity/moderate type/bug The issue is confirmed as a bug.
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sink(ticdc): fix incorrect default field wk989898/tiflow
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@wk989898