Added test cases.

connector/proto/src/test/resources/protobuf/repeated_message.desc

@@ -0,0 +1,19 @@
+
+�
+Bconnector/proto/src/test/resources/protobuf/repeated_message.protoorg.apache.spark.sql.proto"�
+BasicMessage
+id
 
(Rid!
+string_value 
(	RstringValue
+int32_value 
(R
+int32Value
+int64_value 
(R
+int64Value!
+double_value 
(
RdoubleValue
+float_value 
(R
+floatValue
+
+bool_value 
(R	boolValue
+bytes_value 
(R
+bytesValue"`
+RepeatedMessageM
+basic_message
 (2(.org.apache.spark.sql.proto.BasicMessageRbasicMessageBBRepeatedMessageProtosbproto3

connector/proto/src/test/resources/protobuf/repeated_message.proto

@@ -0,0 +1,22 @@
+// To compile and create test class:
+// protoc --java_out=connector/proto/src/test/resources/protobuf/ connector/proto/src/test/resources/protobuf/repeated_message.proto
+// protoc --descriptor_set_out=connector/proto/src/test/resources/protobuf/repeated_message.desc --java_out=connector/proto/src/test/resources/protobuf/org/apache/spark/sql/proto/ connector/proto/src/test/resources/protobuf/repeated_message.proto
+
+syntax = "proto3";
+
+package org.apache.spark.sql.proto;
+option java_outer_classname = "RepeatedMessageProtos";
+
+message BasicMessage {
+  int64 id = 1;
+  string string_value = 2;
+  int32 int32_value = 3;
+  int64 int64_value = 4;
+  double double_value = 5;
+  float float_value = 6;
+  bool bool_value = 7;
+  bytes bytes_value = 8;
+}
+message RepeatedMessage {
+  repeated BasicMessage basic_message = 1;
+}

connector/proto/src/test/scala/org/apache/spark/sql/proto/ProtoFunctionsSuite.scala

@@ -16,16 +16,20 @@
  */
 package org.apache.spark.sql.proto
 
+import com.google.protobuf.ByteString
 import org.apache.spark.SparkException
 import org.apache.spark.sql.QueryTest
 import org.apache.spark.sql.test.SharedSparkSession
 import org.apache.spark.sql.proto.SimpleMessageRepeatedProtos.SimpleMessageRepeated
+import org.apache.spark.sql.proto.RepeatedMessageProtos.{BasicMessage, RepeatedMessage}
 import org.apache.spark.sql.proto.SimpleMessageEnumProtos.{BasicEnum, SimpleMessageEnum}
 import org.apache.spark.sql.proto.SimpleMessageMapProtos.SimpleMessageMap
 import org.apache.spark.sql.proto.MessageMultipleMessage.{IncludedExample, MultipleExample, OtherExample}
 import org.apache.spark.sql.functions.{lit, struct}
 import org.apache.spark.sql.proto.SimpleMessageEnumProtos.SimpleMessageEnum.NestedEnum
 
+import java.util
+
 class ProtoFunctionsSuite extends QueryTest with SharedSparkSession with Serializable {
   import testImplicits._
 
@@ -108,6 +112,62 @@ class ProtoFunctionsSuite extends QueryTest with SharedSparkSession with Seriali
     checkAnswer(fromProtoDF.select($"value_from.*"), toFromProtoDF.select($"value_to_from.*"))
   }
 
+  test("roundtrip in from_proto and to_proto - Repeated Message Once") {
+    val messagePath = testFile("protobuf/repeated_message.desc").replace("file:/", "/")
+    val basicMessage = BasicMessage.newBuilder()
+      .setId(1111L)
+      .setStringValue("value")
+      .setInt32Value(12345)
+      .setInt64Value(0x90000000000L)
+      .setDoubleValue(10000000000.0D)
+      .setBoolValue(true)
+      .setBytesValue(ByteString.copyFromUtf8("ProtobufDeserializer"))
+      .build()
+    val repeatedMessage = RepeatedMessage.newBuilder()
+      .addBasicMessage(basicMessage)
+      .build()
+
+    val df = Seq(repeatedMessage.toByteArray).toDF("value")
+    val fromProtoDF = df.select(functions.from_proto($"value", messagePath, "RepeatedMessage").as("value_from"))
+    val toProtoDF = fromProtoDF.select(functions.to_proto($"value_from", messagePath, "RepeatedMessage").as("value_to"))
+    val toFromProtoDF = toProtoDF.select(functions.from_proto($"value_to", messagePath, "RepeatedMessage").as("value_to_from"))
+    checkAnswer(fromProtoDF.select($"value_from.*"), toFromProtoDF.select($"value_to_from.*"))
+  }
+
+  test("roundtrip in from_proto and to_proto - Repeated Message Twice") {
+    val messagePath = testFile("protobuf/repeated_message.desc").replace("file:/", "/")
+    val baseArray = new util.ArrayList[BasicMessage]();
+    val basicMessage1 = BasicMessage.newBuilder()
+      .setId(1111L)
+      .setStringValue("value1")
+      .setInt32Value(12345)
+      .setInt64Value(0x20000000000L)
+      .setDoubleValue(10000000000.0D)
+      .setBoolValue(true)
+      .setBytesValue(ByteString.copyFromUtf8("ProtobufDeserializer1"))
+      .build()
+    val basicMessage2 = BasicMessage.newBuilder()
+      .setId(2222L)
+      .setStringValue("value2")
+      .setInt32Value(54321)
+      .setInt64Value(0x20000000000L)
+      .setDoubleValue(20000000000.0D)
+      .setBoolValue(false)
+      .setBytesValue(ByteString.copyFromUtf8("ProtobufDeserializer2"))
+      .build()
+    baseArray.add(basicMessage1)
+    baseArray.add(basicMessage2)
+    val repeatedMessage = RepeatedMessage.newBuilder()
+      .addAllBasicMessage(baseArray)
+      .build()
+
+    val df = Seq(repeatedMessage.toByteArray).toDF("value")
+    val fromProtoDF = df.select(functions.from_proto($"value", messagePath, "RepeatedMessage").as("value_from"))
+    val toProtoDF = fromProtoDF.select(functions.to_proto($"value_from", messagePath, "RepeatedMessage").as("value_to"))
+    val toFromProtoDF = toProtoDF.select(functions.from_proto($"value_to", messagePath, "RepeatedMessage").as("value_to_from"))
+    checkAnswer(fromProtoDF.select($"value_from.*"), toFromProtoDF.select($"value_to_from.*"))
+  }
+
   test("roundtrip in from_proto and to_proto - Map") {
     val messagePath = testFile("protobuf/message_with_map.desc").replace("file:/", "/")
     val repeatedMessage = SimpleMessageMap.newBuilder()