Why I'm doing:

What I'm doing:

Minimal length is 1024, which should be allowed.

Fixes #https://github.com/StarRocks/StarRocksTest/issues/10673

What type of PR is this:

[x] BugFix
[ ] Feature
[ ] Enhancement
[ ] Refactor
[ ] UT
[ ] Doc
[ ] Tool

Does this PR entail a change in behavior?

[ ] Yes, this PR will result in a change in behavior.
[x] No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

[ ] Interface/UI changes: syntax, type conversion, expression evaluation, display information
[ ] Parameter changes: default values, similar parameters but with different default values
[ ] Policy changes: use new policy to replace old one, functionality automatically enabled
[ ] Feature removed
[ ] Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

[ ] I have added test cases for my bug fix or my new feature
[ ] This pr needs user documentation (for new or modified features or behaviors)
- [ ] I have added documentation for my new feature or new function
[ ] This is a backport pr

Bugfix cherry-pick branch check:

[x] I have checked the version labels which the pr will be auto-backported to the target branch
- [x] 4.0
- [x] 3.5
- [ ] 3.4
- [ ] 3.3

[!NOTE] Permits schema change from JSON to CHAR/VARCHAR when target length equals the JSON minimum (e.g., 1024).

Catalog

In Column.checkSchemaChangeAllowed, relax JSON length check: change <= to < so converting JSON to CHAR/VARCHAR is allowed when target strLen equals PrimitiveType.JSON.getTypeSize().

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