cloud-fan commented on a change in pull request #27066:
URL: https://github.com/apache/spark/pull/27066#discussion_r430966069
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
##########
@@ -515,3 +515,96 @@ case class StringToMap(text: Expression, pairDelim:
Expression, keyValueDelim: E
override def prettyName: String = "str_to_map"
}
+
+/**
+ * Adds/replaces field in struct by name.
+ *
+ * @param children Seq(struct, name, val)
+ */
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = "_FUNC_(struct, name, val) - Adds/replaces field in struct by name.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(NAMED_STRUCT("a", 1, "b", 2), "c", 3);
+ {"a":1,"b":2,"c":3}
+ > SELECT _FUNC_(NAMED_STRUCT("a", 1, "b", 2), "b", 3);
+ {"a":1,"b":3}
+ > SELECT _FUNC_(CAST(NULL AS struct<a:int,b:int>), "c", 3);
+ {"a":null,"b":null,"c":3}
Review comment:
does this apply to the inner struct as well?
```
with_field(
NAMED_STRUCT("a", 1, "b", CAST(NULL AS struct<a:int,b:int>)),
''b.c",
3)
```
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