mcdull-zhang opened a new issue, #6127:
URL: https://github.com/apache/incubator-gluten/issues/6127
### Backend
VL (Velox)
### Bug description
**empty character**
```txt
Expression: split('abc','')
Spark: ["a","b","c",""]
Gluten: Reason: (0 vs. 1) split only supports only single-character pattern
```
**non-ASCII character**
```txt
Expression: split('a，b，c','，')
Spark: ["a","b","c"]
Gluten: Reason: (3 vs. 1) split only supports only single-character pattern
```
### Spark version
Spark-3.2.x
### Spark configurations
_No response_
### System information
_No response_
### Relevant logs
```bash
java.lang.RuntimeException: Exception: VeloxRuntimeError
Error Source: RUNTIME
Error Code: INVALID_STATE
Reason: (0 vs. 1) split only supports only single-character pattern
Retriable: False
Expression: patternString.size() == 1
Context: split(n0_0, :VARCHAR)
Top-Level Context: Same as context.
Function: apply
File:
ep/build-velox/build/velox_ep/velox/functions/sparksql/SplitFunctions.cpp
```
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