cleanup countAll

Author: wu-hui

google-cloud-firestore/src/main/java/com/google/cloud/firestore/pipeline/expressions/Count.java

@@ -27,4 +27,9 @@ public final class Count extends Function implements Accumulator {
   Count(@Nonnull Expr value) {
     super("count", ImmutableList.of(value));
   }
+
+  @InternalApi
+  Count() {
+    super("count", ImmutableList.of());
+  }
 }

google-cloud-firestore/src/main/java/com/google/cloud/firestore/pipeline/expressions/CountAll.java

@@ -3118,39 +3118,39 @@ public static Count count(String field) {
   }
 
   /**
-   * Creates an aggregation that counts the number of stage inputs that satisfy the provided filter
-   * condition.
+   * Creates an aggregation that counts the total number of stage inputs.
    *
    * <p>Example:
    *
    * <pre>{@code
-   * // Count the number of completed orders
-   * Function.countIf(Field.of("status").eq("completed")).as("completedOrderCount");
+   * // Count the total number of users
+   * Function.countAll().as("totalUsers");
    * }</pre>
    *
-   * @param condition The filter condition that needs to be met for the count to be incremented.
-   * @return A new {@code Accumulator} representing the 'countIf' aggregation.
+   * @return A new {@code Accumulator} representing the 'countAll' aggregation.
    */
   @BetaApi
-  public static CountIf countIf(FilterCondition condition) {
-    return new CountIf(condition, false);
+  public static Count countAll() {
+    return new Count();
   }
 
   /**
-   * Creates an aggregation that counts the total number of stage inputs.
+   * Creates an aggregation that counts the number of stage inputs that satisfy the provided filter
+   * condition.
    *
    * <p>Example:
    *
    * <pre>{@code
-   * // Count the total number of users
-   * Function.countAll().as("totalUsers");
+   * // Count the number of completed orders
+   * Function.countIf(Field.of("status").eq("completed")).as("completedOrderCount");
    * }</pre>
    *
-   * @return A new {@code Accumulator} representing the 'countAll' aggregation.
+   * @param condition The filter condition that needs to be met for the count to be incremented.
+   * @return A new {@code Accumulator} representing the 'countIf' aggregation.
    */
   @BetaApi
-  public static CountAll countAll() {
-    return new CountAll();
+  public static CountIf countIf(FilterCondition condition) {
+    return new CountIf(condition, false);
   }
 
   /**