fix(query): fix incorrect alias of select items

[sundy-li]

I hereby agree to the terms of the CLA available at: https://docs.databend.com/dev/policies/cla/

Summary

fixes #16367

🐳 :) select siphash('y'), siphash('Y');
┌───────────────────────────────────────────┐
│     siphash('y')    │     siphash('Y')    │
│        UInt64       │        UInt64       │
├─────────────────────┼─────────────────────┤
│ 5356863688430645057 │ 9746634682266333199 │
└───────────────────────────────────────────┘
1 row read in 0.038 sec. Processed 1 row, 1B (26.08 rows/s, 26B/s)

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Need tests in bendsql or other clients

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

---

This change is