diff --git a/google-cloud-clients/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/Field.java b/google-cloud-clients/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/Field.java
index 72b84a93ae31..ba0e45e5f358 100644
--- a/google-cloud-clients/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/Field.java
+++ b/google-cloud-clients/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/Field.java
@@ -125,7 +125,8 @@ public Builder setType(LegacySQLTypeName type, Field... subFields) {
      *     Types</a>
      */
     public Builder setType(LegacySQLTypeName type, FieldList subFields) {
-      if (type == LegacySQLTypeName.RECORD) {
+      // LegacySQLTypeName is not an enum, cannot use reference equal.
+      if (LegacySQLTypeName.RECORD.equals(type)) {
         if (subFields == null || subFields.isEmpty()) {
           throw new IllegalArgumentException(
               "The " + type + " field must have at least one sub-field");
diff --git a/google-cloud-clients/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/Job.java b/google-cloud-clients/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/Job.java
index 0643c268b7e0..9a61192c4045 100644
--- a/google-cloud-clients/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/Job.java
+++ b/google-cloud-clients/google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/Job.java
@@ -189,7 +189,7 @@ public boolean exists() {
   public boolean isDone() {
     checkNotDryRun("isDone");
     Job job = bigquery.getJob(getJobId(), JobOption.fields(BigQuery.JobField.STATUS));
-    return job == null || job.getStatus().getState() == JobStatus.State.DONE;
+    return job == null || JobStatus.State.DONE.equals(job.getStatus().getState());
   }
   /**
    * Blocks until this job completes its execution, either failing or succeeding. This method
@@ -293,7 +293,7 @@ public TableResult getQueryResults(QueryResultsOption... options)
 
     // Get the job resource to determine if it has errored.
     Job job = this;
-    if (job.getStatus() == null || job.getStatus().getState() != JobStatus.State.DONE) {
+    if (job.getStatus() == null || !JobStatus.State.DONE.equals(job.getStatus().getState())) {
       job = reload();
     }
     if (job.getStatus() != null && job.getStatus().getError() != null) {
@@ -362,7 +362,7 @@ public TimedAttemptSettings createNextAttempt(
             @Override
             public boolean shouldRetry(Throwable prevThrowable, Job prevResponse) {
               return prevResponse != null
-                  && prevResponse.getStatus().getState() != JobStatus.State.DONE;
+                  && !JobStatus.State.DONE.equals(prevResponse.getStatus().getState());
             }
           },
           options.getClock());
@@ -377,7 +377,7 @@ public boolean shouldRetry(Throwable prevThrowable, Job prevResponse) {
    * <p>Example of reloading all fields until job status is DONE.
    *
    * <pre>{@code
-   * while (job.getStatus().getState() != JobStatus.State.DONE) {
+   * while (!JobStatus.State.DONE.equals(job.getStatus().getState())) {
    *   Thread.sleep(1000L);
    *   job = job.reload();
    * }
@@ -386,7 +386,7 @@ public boolean shouldRetry(Throwable prevThrowable, Job prevResponse) {
    * <p>Example of reloading status field until job status is DONE.
    *
    * <pre>{@code
-   * while (job.getStatus().getState() != JobStatus.State.DONE) {
+   * while (!JobStatus.State.DONE.equals(job.getStatus().getState())) {
    *   Thread.sleep(1000L);
    *   job = job.reload(BigQuery.JobOption.fields(BigQuery.JobField.STATUS));
    * }
diff --git a/google-cloud-clients/google-cloud-bigquery/src/test/java/com/google/cloud/bigquery/FieldTest.java b/google-cloud-clients/google-cloud-bigquery/src/test/java/com/google/cloud/bigquery/FieldTest.java
index ffa545cf91f6..4ba5ad0929a0 100644
--- a/google-cloud-clients/google-cloud-bigquery/src/test/java/com/google/cloud/bigquery/FieldTest.java
+++ b/google-cloud-clients/google-cloud-bigquery/src/test/java/com/google/cloud/bigquery/FieldTest.java
@@ -18,6 +18,11 @@
 
 import static org.junit.Assert.assertEquals;
 
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
 import org.junit.Test;
 
 public class FieldTest {
@@ -92,6 +97,22 @@ public void testToAndFromPb() {
     compareFieldSchemas(field, Field.fromPb(field.toPb()));
   }
 
+  @Test
+  public void testSubFieldWithClonedType() throws Exception {
+    LegacySQLTypeName record = LegacySQLTypeName.RECORD;
+    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+    ObjectOutputStream oos = new ObjectOutputStream(baos);
+    oos.writeObject(record);
+    oos.flush();
+    oos.close();
+    InputStream is = new ByteArrayInputStream(baos.toByteArray());
+    ObjectInputStream ois = new ObjectInputStream(is);
+    LegacySQLTypeName clonedRecord = (LegacySQLTypeName) ois.readObject();
+    ois.close();
+
+    Field.of("field", clonedRecord, Field.of("subfield", LegacySQLTypeName.BOOLEAN));
+  }
+
   private void compareFieldSchemas(Field expected, Field value) {
     assertEquals(expected, value);
     assertEquals(expected.getName(), value.getName());
diff --git a/google-cloud-examples/src/main/java/com/google/cloud/examples/bigquery/snippets/JobSnippets.java b/google-cloud-examples/src/main/java/com/google/cloud/examples/bigquery/snippets/JobSnippets.java
index 11729dd81db1..f9fb7b5fe376 100644
--- a/google-cloud-examples/src/main/java/com/google/cloud/examples/bigquery/snippets/JobSnippets.java
+++ b/google-cloud-examples/src/main/java/com/google/cloud/examples/bigquery/snippets/JobSnippets.java
@@ -113,7 +113,7 @@ public boolean waitForWithOptions() throws InterruptedException {
   // [TARGET reload(JobOption...)]
   public JobStatus.State reload() throws InterruptedException {
     // [START ]
-    while (job.getStatus().getState() != JobStatus.State.DONE) {
+    while (!JobStatus.State.DONE.equals(job.getStatus().getState())) {
       Thread.sleep(1000L);
       job = job.reload();
     }
@@ -125,7 +125,7 @@ public JobStatus.State reload() throws InterruptedException {
   // [TARGET reload(JobOption...)]
   public JobStatus.State reloadStatus() throws InterruptedException {
     // [START ]
-    while (job.getStatus().getState() != JobStatus.State.DONE) {
+    while (!JobStatus.State.DONE.equals(job.getStatus().getState())) {
       Thread.sleep(1000L);
       job = job.reload(BigQuery.JobOption.fields(BigQuery.JobField.STATUS));
     }