[KYUUBI #2782][FOLLOWUP] Add missed UNION_TYPE back

# 🔍 Description
## Issue References 🔗

This pull request fixes #
Fix #6207 (comment)
## Describe Your Solution 🔧

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

## Types of changes 🔖

- [ ] Bugfix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)

## Test Plan 🧪

#### Behavior Without This Pull Request ⚰️

#### Behavior With This Pull Request 🎉

#### Related Unit Tests

---

# Checklist 📝

- [ ] This patch was not authored or co-authored using [Generative Tooling](https://www.apache.org/legal/generative-tooling.html)

**Be nice. Be informative.**

Closes #6209 from turboFei/fix_union_type.

Closes #2782

622c838 [Wang, Fei] miss

Authored-by: Wang, Fei <[email protected]>
Signed-off-by: Wang, Fei <[email protected]>

kyuubi-hive-jdbc/src/main/java/org/apache/kyuubi/jdbc/hive/JdbcColumn.java

@@ -241,6 +241,8 @@ static String getColumnTypeName(TTypeId type) throws SQLException {
         return "struct";
       case NULL_TYPE:
         return "void";
+      case UNION_TYPE:
+        return "uniontype";
       case USER_DEFINED_TYPE:
         return "user_defined";
       default: