[BugFix] fix refresh mv error when hive table has null values in the partition (#51238)

[kobebryantlin0]

Why I'm doing:

When creating a materialized view for Hive Catalog with string type partition, an error occurs when the partition key has __HIVE_DEFAULT_PARTITION__ value .

What I'm doing:

Fixes #51238

What type of PR is this:

• 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.
• 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:

• I have checked the version labels which the pr will be auto-backported to the target branch
  • 3.3
  • 3.2
  • 3.1
  • 3.0
  • 2.5

[kobebryantlin0]

@LiShuMing could you please review this pr with issue

[github-actions]

[FE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[LiShuMing]

Well Done. LGTM.

[sonarcloud]

Quality Gate passed

Issues
10 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

[Java-Extensions Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

[BE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[kobebryantlin0]

@trueeyu @kevincai could you please review this pr? thx