cloud-fan commented on code in PR #52537:
URL: https://github.com/apache/spark/pull/52537#discussion_r2415260178
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sql/api/src/main/scala/org/apache/spark/sql/Column.scala:
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@@ -1424,6 +1424,23 @@ class Column(val node: ColumnNode) extends Logging with
TableValuedFunctionArgum
*/
def outer(): Column = Column(internal.LazyExpression(node))
+ /**
+ * Concise syntax for chaining custom transformations.
+ * {{{
+ * def addPrefix(c: Column): Column = concat(lit("prefix_"), c)
+ *
+ * df.select($"name".transform(addPrefix))
+ *
+ * // Chaining multiple transformations
+ * def uppercase(c: Column): Column = upper(c)
+ * df.select($"name".transform(addPrefix).transform(uppercase))
Review Comment:
```suggestion
* df.select($"name".transform(addPrefix).transform(upper))
```
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