Github user mktal commented on the issue:
https://github.com/apache/incubator-madlib/pull/56
@njayaram2 I removed default values in python and changed default values of
boolean from `NULL` to `False` in sql file. Now in python we can just write
`not partition_expr` to check if it is `True` or `False (None)`, since there is
no need for now to differentiate between `False` and `None`
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