Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/6874#discussion_r32804988
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypes.scala
---
@@ -79,3 +78,42 @@ case class CreateStruct(children: Seq[Expression])
extends Expression {
InternalRow(children.map(_.eval(input)): _*)
}
}
+
+/**
+ * Creates a struct with the given field names and values
+ *
+ * @param children Seq(name1, val1, name2, val2, ...)
+ */
+case class CreateNamedStruct(children: Seq[Expression]) extends Expression
{
+ assert(children.size % 2 == 0, "NamedStruct expects an even number of
arguments.")
+
+ private val nameExprs = children.zipWithIndex.filter(_._2 % 2 ==
0).map(_._1)
+ private val valExprs = children.zipWithIndex.filter(_._2 % 2 ==
1).map(_._1)
+
+ private lazy val names = nameExprs.map { case name =>
+ name match {
+ case NonNullLiteral(str, StringType) =>
+ str.asInstanceOf[UTF8String].toString
+ case _ =>
+ throw new IllegalArgumentException("Expressions of odd index
should be" +
+ s" Literal(_, StringType), get ${name.dataType} instead")
+ }
+ }
--- End diff --
With `checkInputTypes`, we can ensure when we reach here, `nameExprs` is of
correct type and we can simplify the code here as
`nameExprs.map(_.asInstanceOf[Literal].value.toString)`
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