Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/19971
We don't need to as we never fallback in test
```
// try to compile and fallback if it failed
val (_, maxCodeSize) = try {
CodeGenerator.compile(cleanedSource)
} catch {
case _: Exception if !Utils.isTesting &&
sqlContext.conf.codegenFallback =>
// We should already saw the error message
logWarning(s"Whole-stage codegen disabled for this plan:\n
$treeString")
return child.execute()
}
```
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