Roll back PR#4715.

Author: ehsannas

firebase-firestore/CHANGELOG.md

@@ -1,6 +1,5 @@
 # Unreleased
 * [feature] Add support for disjunctions in queries (`OR` queries).
-* [fixed] Fixed stack overflow caused by deeply nested server timestamps (#4702).
 
 # 24.4.4
 * [changed] Relaxed certain query validations performed by the SDK (#4231).

firebase-firestore/src/main/java/com/google/firebase/firestore/model/ServerTimestamps.java

@@ -62,9 +62,8 @@ public static Value valueOf(Timestamp localWriteTime, @Nullable Value previousVa
             .putFields(TYPE_KEY, encodedType)
             .putFields(LOCAL_WRITE_TIME_KEY, encodeWriteTime);
 
-    Value actualPreviousValue = previousValue == null ? null : getPreviousValue(previousValue);
-    if (actualPreviousValue != null) {
-      mapRepresentation.putFields(PREVIOUS_VALUE_KEY, actualPreviousValue);
+    if (previousValue != null) {
+      mapRepresentation.putFields(PREVIOUS_VALUE_KEY, previousValue);
     }
 
     return Value.newBuilder().setMapValue(mapRepresentation).build();

firebase-firestore/src/test/java/com/google/firebase/firestore/local/SQLiteLocalStoreTest.java

@@ -32,29 +32,12 @@
 import static java.util.Collections.emptyList;
 import static java.util.Collections.singletonList;
 
-import com.google.firebase.Timestamp;
 import com.google.firebase.firestore.FieldValue;
 import com.google.firebase.firestore.core.Query;
-import com.google.firebase.firestore.model.DocumentKey;
 import com.google.firebase.firestore.model.FieldIndex;
-import com.google.firebase.firestore.model.FieldPath;
-import com.google.firebase.firestore.model.ObjectValue;
-import com.google.firebase.firestore.model.ServerTimestamps;
-import com.google.firebase.firestore.model.mutation.FieldMask;
-import com.google.firebase.firestore.model.mutation.FieldTransform;
-import com.google.firebase.firestore.model.mutation.PatchMutation;
-import com.google.firebase.firestore.model.mutation.Precondition;
-import com.google.firebase.firestore.model.mutation.ServerTimestampOperation;
-import com.google.firestore.v1.Value;
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.concurrent.atomic.AtomicReference;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.robolectric.RobolectricTestRunner;
@@ -307,60 +290,4 @@ public void testIndexesServerTimestamps() {
     assertOverlayTypes(keyMap("coll/a", CountingQueryEngine.OverlayType.Set));
     assertQueryReturned("coll/a");
   }
-
-  @Test
-  public void testDeeplyNestedServerTimestamps() {
-    Timestamp timestamp = Timestamp.now();
-    Value initialServerTimestamp = ServerTimestamps.valueOf(timestamp, null);
-    Map<String, Value> fields =
-        new HashMap<String, Value>() {
-          {
-            put("timestamp", ServerTimestamps.valueOf(timestamp, initialServerTimestamp));
-          }
-        };
-    FieldPath path = FieldPath.fromSingleSegment("timestamp");
-    FieldMask mask =
-        FieldMask.fromSet(
-            new HashSet<FieldPath>() {
-              {
-                add(path);
-              }
-            });
-    FieldTransform fieldTransform =
-        new FieldTransform(path, ServerTimestampOperation.getInstance());
-    List<FieldTransform> fieldTransforms =
-        new ArrayList<FieldTransform>() {
-          {
-            add(fieldTransform);
-          }
-        };
-    AtomicReference<Throwable> error = new AtomicReference<>();
-    Thread thread =
-        new Thread(
-            Thread.currentThread().getThreadGroup(),
-            () -> {
-              try {
-                for (int i = 0; i < 1000; ++i) {
-                  writeMutation(
-                      new PatchMutation(
-                          DocumentKey.fromPathString("some/object/for/test"),
-                          ObjectValue.fromMap(fields),
-                          mask,
-                          Precondition.NONE,
-                          fieldTransforms));
-                }
-              } catch (Throwable e) {
-                error.set(e);
-              }
-            },
-            "test",
-            1024 * 1024);
-    try {
-      thread.start();
-      thread.join();
-    } catch (InterruptedException e) {
-      throw new AssertionError(e);
-    }
-    assertThat(error.get()).isNull();
-  }
 }