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https://issues.apache.org/jira/browse/SPARK-24949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-24949.
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Resolution: Won't Fix
Let me leave this resolved. Seems difficult to fix but I wonder if it's worth.
Please reopen and go ahead if a PR is ready. Let me leave this resolve till
then.
> pyspark.sql.Column breaks the iterable contract
> -----------------------------------------------
>
> Key: SPARK-24949
> URL: https://issues.apache.org/jira/browse/SPARK-24949
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 2.3.1
> Reporter: Daniel Shields
> Priority: Minor
>
> pyspark.sql.Column implements __iter__ just to raise a TypeError:
> {code:java}
> def __iter__(self):
> raise TypeError("Column is not iterable")
> {code}
> This makes column look iterable even when it isn't:
> {code:java}
> isinstance(mycolumn, collections.Iterable) # Evaluates to True{code}
> This function should be removed from Column completely so it behaves like
> every other non-iterable class.
> For further motivation of why this should be fixed, consider the below
> example, which currently requires listing Column explicitly:
> {code:java}
> def listlike(value):
> # Column unfortunately implements __iter__ just to raise a TypeError.
> # This breaks the iterable contract and should be fixed in Spark proper.
> return isinstance(value, collections.Iterable) and not isinstance(value,
> (str, bytes, pyspark.sql.Column))
> {code}
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