Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9019#discussion_r41925685
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects.scala
---
@@ -0,0 +1,334 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.catalyst.expressions
+
+import scala.language.existentials
+
+import org.apache.spark.sql.catalyst.InternalRow
+import
org.apache.spark.sql.catalyst.expressions.codegen.{GeneratedExpressionCode,
CodeGenContext}
+import org.apache.spark.sql.types._
+
+/**
+ * Invokes a static function, returning the result. By default, any of
the arguments being null
+ * will result in returning null instead of calling the function.
+ *
+ * @param staticObject The target of the static call. This can either be
the object itself
+ * (methods defined on scala objects), or the class
object
+ * (static methods defined in java).
+ * @param dataType The expected return type of the function call
+ * @param functionName The name of the method to call.
+ * @param arguments An optional list of expressions to pass as arguments
to the function.
+ * @param propagateNull When true, and any of the arguments is null, null
will be returned instead
+ * of calling the function.
+ */
+case class StaticInvoke(
+ staticObject: Any,
+ dataType: DataType,
+ functionName: String,
+ arguments: Seq[Expression] = Nil,
+ propagateNull: Boolean = true) extends Expression {
--- End diff --
It's not a `LeafExpression` as there are children (fixed in the followup).
Its not `Unevaluable`, but instead *only* supports codegen.
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