dawidwys commented on a change in pull request #10307: [FLINK-14903][table] 
Relax structured types constraints
URL: https://github.com/apache/flink/pull/10307#discussion_r350053412
 
 

 ##########
 File path: 
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/logical/StructuredType.java
 ##########
 @@ -150,54 +159,62 @@ public int hashCode() {
 
                private @Nullable String description;
 
-               private @Nullable Class<?> implementationClass;
+               public Builder(Class<?> implementationClass) {
+                       this.objectIdentifier = null;
+                       this.implementationClass =
+                               Preconditions.checkNotNull(implementationClass, 
"Implementation class must not be null.");
+               }
+
+               public Builder(ObjectIdentifier objectIdentifier) {
+                       this.objectIdentifier =
+                               Preconditions.checkNotNull(objectIdentifier, 
"Object identifier must not be null.");
+                       this.implementationClass = null;
+               }
+
+               public Builder(ObjectIdentifier objectIdentifier, Class<?> 
implementationClass) {
+                       this.objectIdentifier =
+                               Preconditions.checkNotNull(objectIdentifier, 
"Object identifier must not be null.");
+                       this.implementationClass =
+                               Preconditions.checkNotNull(implementationClass, 
"Implementation class must not be null.");
+               }
 
-               public Builder(ObjectIdentifier objectIdentifier, 
List<StructuredAttribute> attributes) {
-                       this.objectIdentifier = 
Preconditions.checkNotNull(objectIdentifier, "Object identifier must not be 
null.");
+               public Builder attributes(List<StructuredAttribute> attributes) 
{
                        this.attributes = Collections.unmodifiableList(
                                new ArrayList<>(
                                        Preconditions.checkNotNull(attributes, 
"Attributes must not be null.")));
-
-                       Preconditions.checkArgument(
-                               attributes.size() > 0,
-                               "Attribute list must not be empty.");
+                       return this;
                }
 
-               public Builder setNullable(boolean isNullable) {
+               public Builder isNullable(boolean isNullable) {
 
 Review comment:
   nit: Personally I would not use `is` prefix for setters. I'd use this prefix 
only for getters. How about just `nullable`?

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