alamb commented on code in PR #8189:
URL: https://github.com/apache/arrow-rs/pull/8189#discussion_r2291790969


##########
parquet-variant/src/builder.rs:
##########
@@ -306,93 +296,80 @@ impl ValueBuilder {
         self.0.len()
     }
 
-    fn new_object<'a>(
-        &'a mut self,
-        metadata_builder: &'a mut MetadataBuilder,
-    ) -> ObjectBuilder<'a> {
-        let parent_state = ParentState::variant(self, metadata_builder);
-        let validate_unique_fields = false;
-        ObjectBuilder::new(parent_state, validate_unique_fields)
-    }
-
-    fn new_list<'a>(&'a mut self, metadata_builder: &'a mut MetadataBuilder) 
-> ListBuilder<'a> {
-        let parent_state = ParentState::variant(self, metadata_builder);
-        let validate_unique_fields = false;
-        ListBuilder::new(parent_state, validate_unique_fields)
-    }
-
     /// Appends a variant to the builder.
     ///
     /// # Panics
     ///
     /// This method will panic if the variant contains duplicate field names 
in objects
     /// when validation is enabled. For a fallible version, use 
[`ValueBuilder::try_append_variant`]
-    fn append_variant<'m, 'd>(
-        &mut self,
-        variant: Variant<'m, 'd>,
-        metadata_builder: &mut MetadataBuilder,
-    ) {
+    fn append_variant(mut state: ParentState<'_>, variant: Variant<'_, '_>) {
+        let builder = state.value_builder();
         match variant {
-            Variant::Null => self.append_null(),
-            Variant::BooleanTrue => self.append_bool(true),
-            Variant::BooleanFalse => self.append_bool(false),
-            Variant::Int8(v) => self.append_int8(v),
-            Variant::Int16(v) => self.append_int16(v),
-            Variant::Int32(v) => self.append_int32(v),
-            Variant::Int64(v) => self.append_int64(v),
-            Variant::Date(v) => self.append_date(v),
-            Variant::TimestampMicros(v) => self.append_timestamp_micros(v),
-            Variant::TimestampNtzMicros(v) => 
self.append_timestamp_ntz_micros(v),
-            Variant::TimestampNanos(v) => self.append_timestamp_nanos(v),
-            Variant::TimestampNtzNanos(v) => 
self.append_timestamp_ntz_nanos(v),
-            Variant::Decimal4(decimal4) => self.append_decimal4(decimal4),
-            Variant::Decimal8(decimal8) => self.append_decimal8(decimal8),
-            Variant::Decimal16(decimal16) => self.append_decimal16(decimal16),
-            Variant::Float(v) => self.append_float(v),
-            Variant::Double(v) => self.append_double(v),
-            Variant::Binary(v) => self.append_binary(v),
-            Variant::String(s) => self.append_string(s),
-            Variant::ShortString(s) => self.append_short_string(s),
-            Variant::Uuid(v) => self.append_uuid(v),
-            Variant::Object(obj) => self.append_object(metadata_builder, obj),
-            Variant::List(list) => self.append_list(metadata_builder, list),
-            Variant::Time(v) => self.append_time_micros(v),
+            Variant::Null => builder.append_null(),
+            Variant::BooleanTrue => builder.append_bool(true),
+            Variant::BooleanFalse => builder.append_bool(false),
+            Variant::Int8(v) => builder.append_int8(v),
+            Variant::Int16(v) => builder.append_int16(v),
+            Variant::Int32(v) => builder.append_int32(v),
+            Variant::Int64(v) => builder.append_int64(v),
+            Variant::Date(v) => builder.append_date(v),
+            Variant::Time(v) => builder.append_time_micros(v),
+            Variant::TimestampMicros(v) => builder.append_timestamp_micros(v),
+            Variant::TimestampNtzMicros(v) => 
builder.append_timestamp_ntz_micros(v),
+            Variant::TimestampNanos(v) => builder.append_timestamp_nanos(v),
+            Variant::TimestampNtzNanos(v) => 
builder.append_timestamp_ntz_nanos(v),
+            Variant::Decimal4(decimal4) => builder.append_decimal4(decimal4),
+            Variant::Decimal8(decimal8) => builder.append_decimal8(decimal8),
+            Variant::Decimal16(decimal16) => 
builder.append_decimal16(decimal16),
+            Variant::Float(v) => builder.append_float(v),
+            Variant::Double(v) => builder.append_double(v),
+            Variant::Binary(v) => builder.append_binary(v),
+            Variant::String(s) => builder.append_string(s),
+            Variant::ShortString(s) => builder.append_short_string(s),
+            Variant::Uuid(v) => builder.append_uuid(v),
+            Variant::Object(obj) => return Self::append_object(state, obj),
+            Variant::List(list) => return Self::append_list(state, list),
         }
+        state.finish();

Review Comment:
   If there is interest in trying the alternative, how about we make a follow 
on PR



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