fqaiser94 commented on a change in pull request #29795:
URL: https://github.com/apache/spark/pull/29795#discussion_r490633841
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
##########
@@ -541,57 +541,105 @@ case class StringToMap(text: Expression, pairDelim:
Expression, keyValueDelim: E
}
/**
- * Adds/replaces field in struct by name.
+ * Represents an operation to be applied to the fields of a struct.
*/
-case class WithFields(
- structExpr: Expression,
- names: Seq[String],
- valExprs: Seq[Expression]) extends Unevaluable {
+trait StructFieldsOperation {
- assert(names.length == valExprs.length)
+ val resolver: Resolver = SQLConf.get.resolver
+
+ /**
+ * Returns an updated list of StructFields and Expressions that will
ultimately be used
+ * as the fields argument for [[StructType]] and as the children argument for
+ * [[CreateNamedStruct]] respectively inside of [[UpdateFields]].
+ */
+ def apply(values: Seq[(StructField, Expression)]): Seq[(StructField,
Expression)]
+}
Review comment:
@viirya I'm not quite done with this PR yet but I wanted to share it
with you early because some of the changes I'm making in here may be helpful
for #29587 (assuming this PR is accepted). Specifically, it would be possible
to implement sorting of fields in a struct simply by:
```
case class OrderStructFieldsByName() extends StructFieldsOperation {
override def apply(values: Seq[(StructField, Expression)]):
Seq[(StructField, Expression)] =
values.sortBy { case (field, _) => field.name }
}
UpdateFields(structExpr, OrderStructFieldsByName() :: Nil)
```
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