Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/7689#discussion_r35613997
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
---
@@ -168,14 +169,83 @@ case class CreateNamedStruct(children:
Seq[Expression]) extends Expression {
valExprs.zipWithIndex.map { case (e, i) =>
val eval = e.gen(ctx)
eval.code + s"""
- if (${eval.isNull}) {
- ${ev.primitive}.update($i, null);
- } else {
- ${ev.primitive}.update($i, ${eval.primitive});
- }
- """
+ if (${eval.isNull}) {
+ ${ev.primitive}.update($i, null);
+ } else {
+ ${ev.primitive}.update($i, ${eval.primitive});
+ }
+ """
}.mkString("\n")
}
override def prettyName: String = "named_struct"
}
+
+/**
+ * Returns a Row containing the evaluation of all children expressions.
This is a variant that
+ * returns UnsafeRow directly. The unsafe projection operator replaces
[[CreateStruct]] with
+ * this expression automatically at runtime.
+ */
+case class CreateStructUnsafe(children: Seq[Expression]) extends
Expression {
+
+ override def foldable: Boolean = children.forall(_.foldable)
+
+ override lazy val resolved: Boolean = childrenResolved
+
+ override lazy val dataType: StructType = {
+ val fields = children.zipWithIndex.map { case (child, idx) =>
+ child match {
+ case ne: NamedExpression =>
+ StructField(ne.name, ne.dataType, ne.nullable, ne.metadata)
+ case _ =>
+ StructField(s"col${idx + 1}", child.dataType, child.nullable,
Metadata.empty)
+ }
+ }
+ StructType(fields)
+ }
+
+ override def nullable: Boolean = false
+
+ override def eval(input: InternalRow): Any = throw new
UnsupportedOperationException
+
+ override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode):
String = {
+ GenerateUnsafeProjection.createCode(ctx, ev, children)
+ }
+
+ override def prettyName: String = "struct_unsafe"
+}
+
+
+/**
+ * Creates a struct with the given field names and values. This is a
variant that returns
+ * UnsafeRow directly. The unsafe projection operator replaces
[[CreateStruct]] with
+ * this expression automatically at runtime.
+ *
+ * @param children Seq(name1, val1, name2, val2, ...)
+ */
+case class CreateNamedStructUnsafe(children: Seq[Expression]) extends
Expression {
+
+ private lazy val (nameExprs, valExprs) =
+ children.grouped(2).map { case Seq(name, value) => (name, value)
}.toList.unzip
+
+ private lazy val names = nameExprs.map(_.eval(EmptyRow).toString)
--- End diff --
Actually, I see that this is just copied from `CreateNamedStruct` above, so
it should be fine.
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