fqaiser94 commented on a change in pull request #27066:
URL: https://github.com/apache/spark/pull/27066#discussion_r439103364
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
##########
@@ -539,3 +541,90 @@ case class StringToMap(text: Expression, pairDelim:
Expression, keyValueDelim: E
override def prettyName: String = "str_to_map"
}
+
+/**
+ * Adds/replaces field in struct by name.
+ */
+case class WithField(structExpr: Expression, fieldName: String, valueExpr:
Expression)
+ extends Unevaluable {
+
+ private lazy val fieldPath =
CatalystSqlParser.parseMultipartIdentifier(fieldName)
+
+ lazy val toCreateNamedStruct: Expression = toCreateNamedStruct(structExpr,
fieldPath)
+
+ override def children: Seq[Expression] = Seq(structExpr, valueExpr)
+
+ override def dataType: StructType =
toCreateNamedStruct.dataType.asInstanceOf[StructType]
+
+ override def foldable: Boolean = toCreateNamedStruct.foldable
+
+ override def nullable: Boolean = toCreateNamedStruct.nullable
+
+ override def prettyName: String = "with_field"
+
+ override def checkInputDataTypes(): TypeCheckResult = {
+ if (fieldName == null) {
+ TypeCheckResult.TypeCheckFailure("fieldName argument should not be
null.")
+ } else if (fieldName.isEmpty) {
+ TypeCheckResult.TypeCheckFailure("fieldName argument should not be
empty.")
+ } else {
+ checkIntermediateDataTypesAreStruct(structExpr.dataType, fieldPath)
+ }
+ }
+
+ private val resolver = SQLConf.get.resolver
+
+ private def checkIntermediateDataTypesAreStruct(
+ dataType: DataType,
Review comment:
done
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