[GitHub] [iceberg] shenodaguirguis commented on a change in pull request #2496: [#2039] Support default value semantics - API changes

[GitBox <gi...@apache.org>]

shenodaguirguis commented on a change in pull request #2496:
URL: https://github.com/apache/iceberg/pull/2496#discussion_r617877398



##########
File path: api/src/main/java/org/apache/iceberg/types/Types.java
##########
@@ -415,42 +415,74 @@ public int hashCode() {
 
   public static class NestedField implements Serializable {
     public static NestedField optional(int id, String name, Type type) {
-      return new NestedField(true, id, name, type, null);
+      return new NestedField(true, id, name, type, null, null);
     }
 
     public static NestedField optional(int id, String name, Type type, String doc) {
-      return new NestedField(true, id, name, type, doc);
+      return new NestedField(true, id, name, type, null, doc);
+    }
+
+    public static NestedField optional(int id, String name, Type type, Object defaultValue, String doc) {
+      return new NestedField(true, id, name, type, defaultValue, doc);
+    }
+
+    public static NestedField optionalWithDefault(int id, String name, Type type, Object defaultValue) {
+      return new NestedField(true, id, name, type, defaultValue, null);
     }
 
     public static NestedField required(int id, String name, Type type) {
-      return new NestedField(false, id, name, type, null);
+      return new NestedField(false, id, name, type, null, null);
     }
 
     public static NestedField required(int id, String name, Type type, String doc) {
-      return new NestedField(false, id, name, type, doc);
+      return new NestedField(false, id, name, type, null, doc);
+    }
+
+    public static NestedField required(int id, String name, Type type, Object defaultValue, String doc) {
+      validateDefaultValueForRequiredField(defaultValue);
+      return new NestedField(false, id, name, type, defaultValue, doc);
+    }
+
+    public static NestedField requiredWithDefault(int id, String name, Type type, Object defaultValue) {
+      validateDefaultValueForRequiredField(defaultValue);
+      return new NestedField(false, id, name, type, defaultValue, null);
     }
 
     public static NestedField of(int id, boolean isOptional, String name, Type type) {
-      return new NestedField(isOptional, id, name, type, null);
+      return new NestedField(isOptional, id, name, type, null, null);
     }
 
     public static NestedField of(int id, boolean isOptional, String name, Type type, String doc) {
-      return new NestedField(isOptional, id, name, type, doc);
+      return new NestedField(isOptional, id, name, type, null, doc);
+    }
+
+    public static NestedField of(int id, boolean isOptional, String name, Type type, Object defaultValue, String doc) {
+      return new NestedField(isOptional, id, name, type, defaultValue, doc);
+    }
+
+    private static void validateDefaultValueForRequiredField(Object defaultValue) {
+      Preconditions.checkNotNull(defaultValue, "defaultValue cannot be null for a required field");
     }
 
     private final boolean isOptional;
     private final int id;
     private final String name;
     private final Type type;
+    private final Object defaultValue;
     private final String doc;
 
-    private NestedField(boolean isOptional, int id, String name, Type type, String doc) {
+    private NestedField(boolean isOptional, int id, String name, Type type, Object defaultValue, String doc) {
       Preconditions.checkNotNull(name, "Name cannot be null");
       Preconditions.checkNotNull(type, "Type cannot be null");
+      if (defaultValue != null) {
+        Preconditions.checkArgument(defaultValue.getClass() == type.typeId().javaClass(),

Review comment:
       yes




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