[BUG]: Korean UTF-8 characters are corrupted when querying via MCP SQL endpoint.

[Taylor0819]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

Korean UTF-8 characters are corrupted when querying via MCP SQL endpoint.

Same query returns correct data via direct SQL API (/api/2.0/sql/statements),
but returns corrupted characters via MCP API (/api/2.0/mcp/sql).

Direct SQL API result (correct):
["서울지점", "KR", "오프라인"]

MCP SQL API result (broken):
{"string_value": "������������"}

Expected Behavior

Korean characters should be preserved correctly in MCP SQL response,
same as direct SQL Statement API.

Steps To Reproduce:

1. Have a table with Korean text data in Databricks
2. Call MCP SQL endpoint with execute_sql_read_only tool
3. Korean characters appear as "������" in response
4. Same query via /api/2.0/sql/statements returns correct Korean text

Relevant log output:
// MCP API response (broken)
{"string_value":"������������"},{"string_value":"KR"},{"string_value":"������������"}

// Direct SQL API response (correct)
["서울지점", "KR", "오프라인"]

Steps To Reproduce

No response

Relevant log output or Exception details

Operating System

macOS

[hoduulmu]

I have same problem too please fix it