chore: if the bool field is null set the inlined boolean as null (#687)

Author: eduardoramirez

hollow/src/main/java/com/netflix/hollow/core/write/objectmapper/HollowObjectTypeMapper.java

@@ -631,7 +631,9 @@ public void copy(GenericHollowObject rec, Object pojo) {
                     unsafe.putObject(pojo, fieldOffset, rec.getBytes(fieldName));
                     break;
                 case INLINED_BOOLEAN:
-                    unsafe.putObject(pojo, fieldOffset, Boolean.valueOf(rec.getBoolean(fieldName)));
+                    if (!rec.isNull(fieldName)) {
+                        unsafe.putObject(pojo, fieldOffset, Boolean.valueOf(rec.getBoolean(fieldName)));
+                    }
                     break;
                 case INLINED_INT:
                     int inlinedIntValue = rec.getInt(fieldName);

hollow/src/test/java/com/netflix/hollow/core/write/objectmapper/HollowObjectMapperHollowRecordParserTest.java

@@ -131,18 +131,20 @@ public void testNullablesSimpleTypes() {
     TypeWithAllSimpleTypes result = mapper.readHollowRecord(obj);
     Assert.assertEquals(Integer.valueOf(1), result.boxedIntegerField);
     Assert.assertEquals(Character.valueOf('a'), result.boxedCharField);
-    Assert.assertNull(result.boxedFloatField);
+    Assert.assertNull(result.boxedBooleanField);
     Assert.assertNull(result.boxedDoubleField);
+    Assert.assertNull(result.boxedFloatField);
     Assert.assertNull(result.boxedLongField);
     Assert.assertNull(result.boxedShortField);
     Assert.assertNull(result.boxedByteField);
     Assert.assertEquals(0, result.primitiveIntegerField);
+    Assert.assertFalse(result.primitiveBooleanField);
     Assert.assertEquals(0.0, result.primitiveDoubleField, 0);
     Assert.assertEquals(0.0f, result.primitiveFloatField, 0);
     Assert.assertEquals(0L, result.primitiveLongField);
     Assert.assertEquals(0, result.primitiveShortField);
     Assert.assertEquals(0, result.primitiveByteField);
-    Assert.assertEquals(false, result.inlinedBooleanField);
+    Assert.assertNull(result.inlinedBooleanField);
     Assert.assertEquals(Long.valueOf(4L), result.inlinedLongField);
     Assert.assertNull(result.inlinedIntegerField);
     Assert.assertNull(result.inlinedDoubleField);