HyukjinKwon commented on a change in pull request #25628:
[SPARK-28897][Core]'coalesce' error when executing dataframe.na.fill
URL: https://github.com/apache/spark/pull/25628#discussion_r319482514
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameNaFunctions.scala
##########
@@ -435,11 +435,10 @@ final class DataFrameNaFunctions private[sql](df:
DataFrame) {
* Returns a [[Column]] expression that replaces null value in `col` with
`replacement`.
*/
private def fillCol[T](col: StructField, replacement: T): Column = {
- val quotedColName = "`" + col.name + "`"
Review comment:
Does `.` work too?
```scala
scala> val df = spark.range(1).selectExpr("1 as `a.b`")
df: org.apache.spark.sql.DataFrame = [a.b: int]
scala> df.col("a.b")
org.apache.spark.sql.AnalysisException: Cannot resolve column name "a.b"
among (a.b);
at org.apache.spark.sql.Dataset.$anonfun$resolve$1(Dataset.scala:259)
at scala.Option.getOrElse(Option.scala:138)
at org.apache.spark.sql.Dataset.resolve(Dataset.scala:259)
at org.apache.spark.sql.Dataset.col(Dataset.scala:1340)
... 47 elided
```
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