Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/19813
IMHO, in general, the output `ev.value` would be declared as local variable
by parent as
```
s"""${ctx.javaType(dataType)} ${ev.value} = ${ctx.defaultValue(dataType)};
```
Such as cases cannot have an expression in `ev.value`.
As @viirya pointed out, I imagine there are a few scenarios. Would it be
possible to show an example and place in source code where an expression is
used as output in order to correctly understand the issue?
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