*: Fix possibly invalid vector default values

[breezewish]

What problem does this PR solve?

Issue Number: ref #54245

Problem Summary:

In non-strict mode, 0-sized vector may be wrongly inserted into a Non-Zero-Sized vector column:

set @session.sql_mode='';
create table x(e vector(3) not null comment 'hnsw(distance=l2)');
insert into x values();

What changed and how does it work?

Forbid such values in any SQL modes.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[JaySon-Huang]

I think the error message "can't have a default value" is incorrect.

the default value of VECTOR column 'embedding' should be defined as (VEC_FROM_TEXT(...))?

[breezewish]

Good catch.. It is blindly inherited from BLOB/TEXT/JSON column '%-.192s' can't have a default value. We could provide a more friendly description for the VECTOR.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 6 lines in your changes missing coverage. Please review.

Project coverage is 76.2653%. Comparing base (a5e07a2) to head (d83bd88).
Report is 43 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #56286        +/-   ##
================================================
+ Coverage   73.4625%   76.2653%   +2.8027%     
================================================
  Files          1605       1639        +34     
  Lines        445096     456881     +11785     
================================================
+ Hits         326979     348442     +21463     
+ Misses        98081      86742     -11339     
- Partials      20036      21697      +1661     

Flag	Coverage Δ
integration	52.3773% <4.7619%> (?)
unit	72.5513% <71.4285%> (+0.0084%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.9478% <ø> (ø)
parser	∅ <ø> (∅)
br	64.8211% <ø> (+18.8069%)	⬆️

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-25 06:58:30.860975714 +0000 UTC m=+1635580.601399653: ☑️ agreed by hawkingrei.
• 2024-09-25 07:52:10.398406727 +0000 UTC m=+1638800.138830662: ☑️ agreed by XuHuaiyu.

[breezewish]

/retest-required

[JaySon-Huang]

lgtm

[ti-chi-bot]

@JaySon-Huang: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

lgtm

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, JaySon-Huang, wjhuang2016, XuHuaiyu

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• pkg/ddl/OWNERS [wjhuang2016]
• pkg/expression/OWNERS [XuHuaiyu]
• pkg/table/OWNERS [wjhuang2016]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment