Github user smurakozi commented on a diff in the pull request:
https://github.com/apache/spark/pull/20243#discussion_r161763865
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/streaming/sources/ConsoleWriterSuite.scala
---
@@ -0,0 +1,79 @@
+/*
+ * 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.streaming.sources
+
+import java.io.ByteArrayOutputStream
+
+import org.apache.spark.sql.execution.streaming.MemoryStream
+import org.apache.spark.sql.streaming.StreamTest
+
+class ConsoleWriterSuite extends StreamTest {
+ import testImplicits._
+
+ test("console") {
+ val input = MemoryStream[Int]
+
+ val captured = new ByteArrayOutputStream()
+ Console.withOut(captured) {
+ val query = input.toDF().writeStream.format("console").start()
+ try {
+ input.addData(1, 2, 3)
+ query.processAllAvailable()
+ input.addData(4, 5, 6)
+ query.processAllAvailable()
+ input.addData()
+ query.processAllAvailable()
+ } finally {
+ query.stop()
+ }
+ }
+
+ assert(captured.toString() ==
+ """-------------------------------------------
+ |Batch: 0
+ |-------------------------------------------
+ |+-----+
+ ||value|
+ |+-----+
+ || 1|
+ || 2|
+ || 3|
+ |+-----+
+ |
+ |-------------------------------------------
+ |Batch: 1
+ |-------------------------------------------
+ |+-----+
+ ||value|
+ |+-----+
+ || 4|
+ || 5|
+ || 6|
+ |+-----+
+ |
+ |-------------------------------------------
+ |Batch: 2
+ |-------------------------------------------
+ |+-----+
+ ||value|
+ |+-----+
+ |+-----+
+ |
+ |""".stripMargin)
+ }
+}
--- End diff --
We could have a test to check numrows, something like this:
```
test("console with numRows") {
val input = MemoryStream[Int]
val captured = new ByteArrayOutputStream()
Console.withOut(captured) {
val query =
input.toDF().writeStream.format("console").option("NUMROWS", 2).start()
try {
input.addData(1, 2, 3)
query.processAllAvailable()
} finally {
query.stop()
}
}
assert(captured.toString() ==
"""-------------------------------------------
|Batch: 0
|-------------------------------------------
|+-----+
||value|
|+-----+
|| 1|
|| 2|
|+-----+
|only showing top 2 rows
|
|""".stripMargin)
}
test("console with truncation") {
val input = MemoryStream[String]
val captured = new ByteArrayOutputStream()
Console.withOut(captured) {
val query =
input.toDF().writeStream.format("console").option("TRUNCATE", true).start()
try {
input.addData("123456789012345678901234567890")
query.processAllAvailable()
} finally {
query.stop()
}
}
assert(captured.toString() ==
"""-------------------------------------------
|Batch: 0
|-------------------------------------------
|+--------------------+
|| value|
|+--------------------+
||12345678901234567...|
|+--------------------+
|
|""".stripMargin)
}
```
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