Github user petermaxlee commented on a diff in the pull request:
https://github.com/apache/spark/pull/13969#discussion_r70200185
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Reflect.scala
---
@@ -0,0 +1,174 @@
+/*
+ * 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 java.lang.reflect.Method
+
+import scala.util.Try
+
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.analysis.TypeCheckResult
+import
org.apache.spark.sql.catalyst.analysis.TypeCheckResult.{TypeCheckFailure,
TypeCheckSuccess}
+import org.apache.spark.sql.catalyst.expressions.codegen.CodegenFallback
+import org.apache.spark.sql.types._
+import org.apache.spark.unsafe.types.UTF8String
+import org.apache.spark.util.Utils
+
+/**
+ * An expression that invokes a method on a class via reflection.
+ *
+ * For now, only types defined in `Reflect.typeMapping` are supported
(basically primitives
+ * and string) as input types, and the output is turned automatically to a
string.
+ *
+ * @param children the first element should be a literal string for the
class name,
+ * and the second element should be a literal string for
the method name,
+ * and the remaining are input arguments to the Java
method.
+ */
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = "_FUNC_(class,method[,arg1[,arg2..]]) calls method with
reflection",
+ extended = "> SELECT _FUNC_('java.util.UUID', 'randomUUID');\n
c33fb387-8500-4bfa-81d2-6e0e3e930df2")
+// scalastyle:on line.size.limit
+case class Reflect(children: Seq[Expression])
--- End diff --
It is also annoying if we search for reflect (based on the name) and then
doesn't find an expression with reflect in the name.
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