fqaiser94 commented on a change in pull request #27066:
URL: https://github.com/apache/spark/pull/27066#discussion_r448427144
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File path: sql/core/src/main/scala/org/apache/spark/sql/Column.scala
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@@ -871,6 +871,63 @@ class Column(val expr: Expression) extends Logging {
*/
def getItem(key: Any): Column = withExpr { UnresolvedExtractValue(expr,
Literal(key)) }
+ /**
+ * An expression that adds/replaces field in `StructType` by name.
+ *
+ * {{{
+ * val df = sql("SELECT named_struct('a', 1, 'b', 2) struct_col")
+ * df.select($"struct_col".withField("c", lit(3)))
+ * // result: {"a":1,"b":2,"c":3}
+ *
+ * val df = sql("SELECT named_struct('a', 1, 'b', 2) struct_col")
+ * df.select($"struct_col".withField("b", lit(3)))
+ * // result: {"a":1,"b":3}
+ *
+ * val df = sql("SELECT CAST(NULL AS struct<a:int,b:int>) struct_col")
+ * df.select($"struct_col".withField("c", lit(3)))
+ * // result: null of type struct<a:int,b:int,c:int>
+ *
+ * val df = sql("SELECT named_struct('a', 1, 'b', 2, 'b', 3) struct_col")
+ * df.select($"struct_col".withField("b", lit(100)))
+ * // result: {"a":1,"b":100,"b":100}
+ *
+ * val df = sql("SELECT named_struct('a', named_struct('a', 1, 'b', 2))
struct_col")
+ * df.select($"struct_col".withField("a.c", lit(3)))
+ * // result: {"a":{"a":1,"b":2,"c":3}}
+ * }}}
+ *
+ * @group expr_ops
+ * @since 3.1.0
+ */
+ def withField(fieldName: String, col: Column): Column = withExpr {
+ val nameParts = if (fieldName.isEmpty) {
+ fieldName :: Nil
Review comment:
I consider this to be resolved given the results of the discussion
[here](https://github.com/apache/spark/pull/27066#discussion_r448416127).
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