imback82 commented on a change in pull request #26593: [SPARK-29890][SQL]
DataFrameNaFunctions.fill should handle duplicate columns
URL: https://github.com/apache/spark/pull/26593#discussion_r348724702
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameNaFunctions.scala
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@@ -130,20 +130,20 @@ final class DataFrameNaFunctions private[sql](df:
DataFrame) {
*
Review comment:
Actually, `drop` shows different behavior for `*` since it's using
`df.resolve` instead of `df.col`:
```Scala
scala> right.na.drop(Seq("*")).show
org.apache.spark.sql.AnalysisException: Cannot resolve column name "*" among
(col1, col2);
at org.apache.spark.sql.Dataset$$anonfun$resolve$1.apply(Dataset.scala:223)
```
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