Github user dongjoon-hyun commented on the pull request:
https://github.com/apache/spark/pull/12340#issuecomment-210609296
It's because that is the real behavior of `assert_null`. When I used
implicit type cast yesterday. It works differently with Hive assert_null. For
example,
```
hive> select assert_true(1);
OK
NULL
hive> select assert_true(0);
OK
Failed with exception
java.io.IOException:org.apache.hadoop.hive.ql.metadata.HiveException:
ASSERT_TRUE(): assertion failed.
Time taken: 0.062 seconds
```
I didn't have the old code, but maybe what you mean is the following, right?
```
hive> select not(0);
FAILED: ClassCastException
org.apache.hadoop.hive.serde2.objectinspector.primitive.WritableConstantIntObjectInspector
cannot be cast to
org.apache.hadoop.hive.serde2.objectinspector.primitive.BooleanObjectInspector
```
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