Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/20567
Seems it happened to fix this case too:
```python
spark.conf.set("spark.sql.execution.arrow.enabled", "false")
df = spark.createDataFrame([[bytearray("a")]])
df.toPandas()
spark.conf.set("spark.sql.execution.arrow.enabled", "true")
df.toPandas()
```
**Before**
```
_1
0 [97]
_1
0 a
```
**After**
```
_1
0 [97]
... UserWarning...
_1
0 [97]
```
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