Nested fields in PartitionSpec

core/src/test/java/org/apache/iceberg/TestPartitionData.java

@@ -0,0 +1,18 @@
+package org.apache.iceberg;
+
+import org.junit.Test;
+
+import static org.apache.iceberg.types.Types.*;
+
+public class TestPartitionData {
+  private static final Schema SCHEMA = new Schema(
+      NestedField.required(1, "a_struct", StructType.of(
+          NestedField.required(2, "a_primitive", LongType.get())))
+  );
+
+  @Test
+  public void testNestedField() {
+    PartitionSpec spec = PartitionSpec.builderFor(SCHEMA).identity("a_struct.a_primitive").build();
+    new PartitionData(spec.partitionType());
+  }
+}