Github user maropu commented on the issue:
https://github.com/apache/spark/pull/21860
In the description, can you simplify the example query? e.g.,
```
import org.apache.spark.sql.execution.debug._
spark.range(1).selectExpr("id AS key", "id AS
value").groupBy("key").agg(sum("value")).debugCodegen
```
I think the complicated query makes others hard to understand the proposal
point.
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