315157973 commented on a change in pull request #6868:
URL: https://github.com/apache/pulsar/pull/6868#discussion_r436577000



##########
File path: 
pulsar-functions/instance/src/main/java/org/apache/pulsar/functions/source/TopicSchema.java
##########
@@ -158,6 +173,20 @@ private static SchemaType getDefaultSchemaType(Class<?> 
clazz) {
         }
     }
 
+    private static <T> AvroSchema<T> buildAvroSchema(Class<T> clazz, 
ConsumerConfig conf) {
+        String jsr310ConversionEnabled = null;
+        String alwaysAllowNull = null;
+        if (conf.getSchemaProperties() != null) {

Review comment:
       > Please use `SchemaDefinitionBuilder#withProperties` to construct the 
schema definition and avoid adding this kind of customization code. Also, the 
schema properties should be passed to other schemas as well.
   
   Modify as follows:
   1 Since the map generated by protobuf is immutable, a new Map is added to 
TopicSchema line 161.
   2 Since the parameters such as JSR310 in SchemaDefinitionBuilder are 
underlined,the incoming parameters will be converted
   @sijie 
   

##########
File path: 
pulsar-client/src/main/java/org/apache/pulsar/client/impl/schema/SchemaDefinitionBuilderImpl.java
##########
@@ -35,7 +35,9 @@
 public class SchemaDefinitionBuilderImpl<T> implements 
SchemaDefinitionBuilder<T> {
 
     public static final String ALWAYS_ALLOW_NULL = "__alwaysAllowNull";
+    public static final String ALWAYS_ALLOW_NULL_NO_UNDERLINED = 
"alwaysAllowNull";

Review comment:
       Already use existing settings。This may cause some parameters to be 
underscores, some not
   @sijie 
   




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