Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10943#discussion_r51355492
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -150,6 +153,17 @@ class DataFrame private[sql](
}
}
+ /**
+ * Resolves a column name. This is called when it is required to resolve
a column by its
+ * name only and not as a column path..
+ */
+ private[sql] def resolveColName(colName: String, userSuppliedName:
String): Boolean = {
--- End diff --
how about
```
private[sql] def indexOf(colName: String): Option[Int] = {
val resolver = sqlContext.analyzer.resolver
val index = queryExecution.analyzed.output.indexWhere(f =>
resolver(f.name, colName))
if (index >= 0) Some(index) else None
}
```
then we can rewrite `withColumn` to:
```
indexOf(colName).map { index =>
select(output.updated(index, col.as(colName)).map(Column(_)) : _*)
}.getOrElse {
select(Column("*"), col.as(colName))
}
```
There may be better name for this, like `resolveToIndex`
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