Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21889#discussion_r209528285
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SelectedField.scala ---
@@ -0,0 +1,134 @@
+/*
+ * 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.execution
+
+import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.types._
+
+/**
+ * A Scala extractor that builds a
[[org.apache.spark.sql.types.StructField]] from a Catalyst
+ * complex type extractor. For example, consider a relation with the
following schema:
+ *
+ * {{{
+ * root
+ * |-- name: struct (nullable = true)
+ * | |-- first: string (nullable = true)
+ * | |-- last: string (nullable = true)
+ * }}}
--- End diff --
indentation
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