Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/17160
**without `__contains__`, `__nonzero__` and `__bool__`**
```python
class Column(object): pass
>>> 1 in Column()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: argument of type 'Column' is not iterable
>>> bool(Column())
True
```
**without `__nonzero__` and `__bool__`**
```python
class Column(object):
def __contains__(self, item):
print "I am contains"
return Column()
>>> 1 in Column()
I am contains
True
>>> bool(Column())
True
```
**without `__contains__`**
```python
class Column(object):
def __nonzero__(self):
print "I am nonzero"
return Column()
>>> 1 in Column()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: argument of type 'Column' is not iterable
>>> bool(Column())
I am nonzero
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: __nonzero__ should return bool or int, returned Column
```
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