Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21889#discussion_r209526908
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetSchemaPruningSuite.scala
---
@@ -0,0 +1,245 @@
+/*
+ * 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.datasources.parquet
+
+import java.io.File
+
+import org.scalactic.Equality
+
+import org.apache.spark.sql.{DataFrame, QueryTest, Row}
+import org.apache.spark.sql.catalyst.parser.CatalystSqlParser
+import org.apache.spark.sql.execution.FileSourceScanExec
+import org.apache.spark.sql.internal.SQLConf
+import org.apache.spark.sql.test.SharedSQLContext
+import org.apache.spark.sql.types.StructType
+
+class ParquetSchemaPruningSuite
+ extends QueryTest
+ with ParquetTest
+ with SharedSQLContext {
+ case class FullName(first: String, middle: String, last: String)
+ case class Contact(
+ id: Int,
+ name: FullName,
+ address: String,
+ pets: Int,
+ friends: Array[FullName] = Array(),
+ relatives: Map[String, FullName] = Map())
+
+ val janeDoe = FullName("Jane", "X.", "Doe")
+ val johnDoe = FullName("John", "Y.", "Doe")
+ val susanSmith = FullName("Susan", "Z.", "Smith")
+
+ private val contacts =
+ Contact(0, janeDoe, "123 Main Street", 1, friends = Array(susanSmith),
+ relatives = Map("brother" -> johnDoe)) ::
+ Contact(1, johnDoe, "321 Wall Street", 3, relatives = Map("sister" ->
janeDoe)) :: Nil
+
+ case class Name(first: String, last: String)
+ case class BriefContact(id: Int, name: Name, address: String)
+
+ private val briefContacts =
+ BriefContact(2, Name("Janet", "Jones"), "567 Maple Drive") ::
+ BriefContact(3, Name("Jim", "Jones"), "6242 Ash Street") :: Nil
+
+ case class ContactWithDataPartitionColumn(
+ id: Int,
+ name: FullName,
+ address: String,
+ pets: Int,
+ friends: Array[FullName] = Array(),
--- End diff --
nit: `Array.empty[FullName]`
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