Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/17432
The project will get eliminated by the optimizer. From the JIRA ticket:
```scala
import org.apache.spark.sql.expressions.Window
val win_spec_max =
Window.partitionBy("x").orderBy("AmtPaid").rowsBetween(Window.unboundedPreceding,
0)
val df = Seq((1, 2.0), (1, 3.0), (1, 1.0), (1, -2.0), (1, -1.0)).toDF("x",
"AmtPaid")
val df_with_sum = df.withColumn("AmtPaidCumSum",
sum(col("AmtPaid")).over(win_spec_max))
val df_with_max = df_with_sum.withColumn("AmtPaidCumSumMax",
max(col("AmtPaidCumSum")).over(win_spec_max))
df_with_max.explain
```
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