# 🔍 Description
## Issue References 🔗
This pull request fixes#6581
## 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.
I modified `KyuubiSparkSQLAstBuilder#visitMultipartIdentifier` and implemented `KyuubiSparkSQLAstBuilder#visitQuotedIdentifier` to process the quoted identifiers.
## Types of changes 🔖
- [x] 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
```
extensions/spark/kyuubi-extension-spark-3-3/src/test/scala/org/apache/spark/sql/ZorderSuiteBase.scala
test("optimize sort by backquoted column name")
```
---
# Checklist 📝
- [x] This patch was not authored or co-authored using [Generative Tooling](https://www.apache.org/legal/generative-tooling.html)
**Be nice. Be informative.**
Closes#6582 from XorSum/features/zorder-backquote.
Closes#6582
16ffa1238 [xorsum] zorder by support quote
Authored-by: xorsum <xorsum@outlook.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>
d414535cb6