Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/19730
Working for this. I met another problem. [This
code](https://github.com/kiszk/spark/blob/83fef403b92a96a13421901d161a0df5e6a6d7b3/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala#L855)
creates a lot of global variable.
Since `UTF8String.IntWrapper` can be reused, I am writing the following
code.
```
val wrapper = "intWrapper"
if (!ctx.mutableStates.exists(s => s._1 == wrapper)) {
ctx.addMutableState("UTF8String.IntWrapper", wrapper,
s"$wrapper = new UTF8String.IntWrapper();")
}
```
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