Fix hashcode bug

Author: elharo

presto-orc/src/main/java/com/facebook/presto/orc/metadata/statistics/HiveBloomFilter.java

@@ -67,7 +67,7 @@ public boolean equals(Object o)
     @Override
     public int hashCode()
     {
-        return Objects.hash(numBits, numHashFunctions, bitSet.getData());
+        return Objects.hash(numBits, numHashFunctions, Arrays.hashCode(bitSet.getData()));
     }
 
     @Override

presto-orc/src/test/java/com/facebook/presto/orc/metadata/statistics/TestHiveBloomFilter.java

@@ -0,0 +1,35 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.facebook.presto.orc.metadata.statistics;
+
+import com.google.common.collect.ImmutableList;
+import org.testng.annotations.Test;
+
+import java.util.List;
+
+import static org.testng.Assert.assertEquals;
+
+public class TestHiveBloomFilter
+{
+    @Test
+    public void testHashCode()
+    {
+        List<Long> bitset1 = ImmutableList.of(2L);
+        List<Long> bitset2 = ImmutableList.of(2L);
+        HiveBloomFilter filter1 = new HiveBloomFilter(bitset1, 1, 1);
+        HiveBloomFilter filter2 = new HiveBloomFilter(bitset2, 1, 1);
+        assertEquals(filter1, filter2);
+        assertEquals(filter1.hashCode(), filter2.hashCode());
+    }
+}