Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18654#discussion_r127869754
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/FileFormatWriterSuite.scala
---
@@ -0,0 +1,52 @@
+/*
+ * 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
+
+import java.io.{File, FilenameFilter}
+
+import org.apache.spark.sql.QueryTest
+import org.apache.spark.sql.test.SharedSQLContext
+
+class FileFormatWriterSuite extends QueryTest with SharedSQLContext {
+
+ test("empty file should be skipped while write to file") {
+ withTempDir { dir =>
+ dir.delete()
+ spark.range(10000).repartition(10).write.parquet(dir.toString)
+ val df = spark.read.parquet(dir.toString)
+ val allFiles = dir.listFiles(new FilenameFilter {
+ override def accept(dir: File, name: String): Boolean = {
+ !name.startsWith(".") && !name.startsWith("_")
+ }
+ })
+ assert(allFiles.length == 10)
+
+ withTempDir { dst_dir =>
+ dst_dir.delete()
+ df.where("id = 50").write.parquet(dst_dir.toString)
--- End diff --
I mean.. for example, if we happen to have a single partition in the `df`
in any event, I guess this test will become invalid ...
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