[VL] Gluten write more shuffle data than vanilla Spark

### Backend

VL (Velox)

### Bug description

I can see that for the same record numbers, gluten always write much larger shuffle data than vanilla, why? From my understanding, gluten should use less storage since it's written in columnar format.

gluten


vanilla


### Spark version

Spark-3.2.x

### Spark configurations

_No response_

### System information

gluten version: 1.3.0

### Relevant logs

```bash

```