taiyang-li opened a new issue, #7232:
URL: https://github.com/apache/incubator-gluten/issues/7232
### Description
In spark `select unhex('GG')` returns null which in CH it returns
``` sql
SELECT unhex('GG')
Query id: 4dd99748-a1ed-4b08-8aa2-5d663f74d740
┌─unhex('GG')─┐
1. │ � │
└─────────────┘
1 row in set. Elapsed: 0.002 sec.
```
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