cloud-fan commented on pull request #30350:
URL: https://github.com/apache/spark/pull/30350#issuecomment-799671579
I found a behavior change here.
Before this commit
```
scala> sql("select conv(-100, 10, 10)").show(20, false)
+----------------------------------+
|conv(CAST(-100 AS STRING), 10, 10)|
+----------------------------------+
|18446744073709551516 |
+----------------------------------+
```
After this commit
```
scala> sql("select conv(-100, 10, 10)").show(20, false)
+------------------+
|conv(-100, 10, 10)|
+------------------+
|-100 |
+------------------+
```
If the `toBase` is positive, the result is unsigned. It's a bit hard to
reason about how to put a negative value into an unsigned value, but MySQL
returns the same result as before this commit and the overflow behavior seems
to be desirable. @AngersZhuuuu can you take a look?
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