cloud-fan commented on pull request #27066:
URL: https://github.com/apache/spark/pull/27066#issuecomment-646454562
Ah sorry I didn't look into the details and just want to point out the
direction.
Let's take `Alias` as an example
```
override def eval(input: InternalRow): Any = child.eval(input)
/** Just a simple passthrough for code generation. */
override def genCode(ctx: CodegenContext): ExprCode = child.genCode(ctx)
override protected def doGenCode(ctx: CodegenContext, ev: ExprCode):
ExprCode = {
throw new IllegalStateException("Alias.doGenCode should not be called.")
}
```
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