Add unit test in BitSetSuite for BitSet#anySet()

Author: tedyu

unsafe/src/main/java/org/apache/spark/unsafe/bitset/BitSet.java

@@ -102,4 +102,12 @@ public boolean isSet(int index) {
   public int nextSetBit(int fromIndex) {
     return BitSetMethods.nextSetBit(baseObject, baseOffset, fromIndex, numWords);
   }
+
+  /*
+   * @return whether any bit in the BitSet is set
+   */
+  public boolean anySet() {
+    return BitSetMethods.anySet(baseObject, baseOffset, numWords*BitSetMethods.WORD_SIZE);
+  }
+
 }

unsafe/src/main/java/org/apache/spark/unsafe/bitset/BitSetMethods.java

@@ -28,8 +28,7 @@
  */
 public final class BitSetMethods {
 
-  private static final long WORD_SIZE = 8;
-  private static final int SIZE_OF_LONG = Long.SIZE;
+  static final long WORD_SIZE = 8;
 
   private BitSetMethods() {
     // Make the default constructor private, since this only holds static methods.
@@ -72,10 +71,10 @@ public static boolean isSet(Object baseObject, long baseOffset, int index) {
    * Returns {@code true} if any bit is set.
    */
   public static boolean anySet(Object baseObject, long baseOffset, long bitSetWidthInBytes) {
-    assert bitSetWidthInBytes % SIZE_OF_LONG == 0;
-    int widthInLong = (int)(bitSetWidthInBytes / SIZE_OF_LONG);
+    assert bitSetWidthInBytes % WORD_SIZE == 0;
+    int widthInLong = (int)(bitSetWidthInBytes / WORD_SIZE);
     long addr = baseOffset;
-    for (int i = 0; i <= widthInLong; i++, addr += SIZE_OF_LONG) {
+    for (int i = 0; i <= widthInLong; i++, addr += WORD_SIZE) {
       if (PlatformDependent.UNSAFE.getLong(baseObject, addr) != 0) {
         return true;
       }

unsafe/src/test/java/org/apache/spark/unsafe/bitset/BitSetSuite.java

@@ -39,6 +39,7 @@ public void basicOps() {
     for (int i = 0; i < bs.capacity(); i++) {
       Assert.assertFalse(bs.isSet(i));
     }
+    Assert.assertFalse(bs.anySet());
 
     // Set every bit and check it.
     for (int i = 0; i < bs.capacity(); i++) {