jerrypeng commented on a change in pull request #1845: Functions schema 
integration
URL: https://github.com/apache/incubator-pulsar/pull/1845#discussion_r191030390
 
 

 ##########
 File path: 
pulsar-functions/instance/src/main/java/org/apache/pulsar/functions/source/PulsarSource.java
 ##########
 @@ -34,17 +40,29 @@
 import org.apache.pulsar.io.core.Source;
 import org.jboss.util.Classes;
 
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.concurrent.TimeUnit;
-
 @Slf4j
 public class PulsarSource<T> implements Source<T> {
 
     private PulsarClient pulsarClient;
     private PulsarSourceConfig pulsarSourceConfig;
-    private Map<String, SerDe> topicToSerDeMap = new HashMap<>();
+    private Map<String, SerDe<T>> topicToSerDeMap = new HashMap<>();
+
+    private final Schema<T> emptySchema = new Schema<T>() {
 
 Review comment:
   Why is this needed?

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