rdblue commented on code in PR #3221:
URL: https://github.com/apache/parquet-java/pull/3221#discussion_r2130625524


##########
parquet-avro/src/main/java/org/apache/parquet/avro/AvroWriteSupport.java:
##########
@@ -181,9 +184,58 @@ public void write(T record) {
   }
 
   private void writeRecord(GroupType schema, Schema avroSchema, Object record) 
{
-    recordConsumer.startGroup();
-    writeRecordFields(schema, avroSchema, record);
-    recordConsumer.endGroup();
+    if (schema.getLogicalTypeAnnotation() instanceof 
LogicalTypeAnnotation.VariantLogicalTypeAnnotation) {
+      writeVariantFields(schema, avroSchema, record);
+    } else {
+      recordConsumer.startGroup();
+      writeRecordFields(schema, avroSchema, record);
+      recordConsumer.endGroup();
+    }
+  }
+
+  private void writeVariantFields(GroupType schema, Schema avroSchema, Object 
record) {
+    List<Type> fields = schema.getFields();
+    List<Schema.Field> avroFields = avroSchema.getFields();
+    boolean binarySchema = true;
+    ByteBuffer metadata = null;
+    ByteBuffer value = null;
+    // Extract the value and metadata binary.
+    for (int index = 0; index < avroFields.size(); index++) {
+      Schema.Field avroField = avroFields.get(index);
+      Schema fieldSchema = AvroSchemaConverter.getNonNull(avroField.schema());
+      if (!fieldSchema.getType().equals(Schema.Type.BYTES)) {
+        binarySchema = false;
+        break;
+      }
+      Type fieldType = fields.get(index);
+      if (fieldType.getName() == "value") {
+        Object valueObj = model.getField(record, avroField.name(), index);
+        if (valueObj instanceof byte[]) {
+          value = ByteBuffer.wrap((byte[]) valueObj);
+        } else {
+          value = (ByteBuffer) valueObj;
+        }
+      } else if (fieldType.getName() == "metadata") {
+        Object metadataObj = model.getField(record, avroField.name(), index);
+        if (metadataObj instanceof byte[]) {
+          metadata = ByteBuffer.wrap((byte[]) metadataObj);
+        } else {
+          metadata = (ByteBuffer) metadataObj;
+        }
+      } else {
+        binarySchema = false;
+        break;
+      }
+    }
+
+    if (binarySchema) {
+      VariantValueWriter.write(recordConsumer, schema, new Variant(value, 
metadata));
+    } else {
+      // If the schema was something other than value and metaadata, treat the 
value as a non-variant record.

Review Comment:
   Typo: `metaa`



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