Github user srinathshankar commented on a diff in the pull request:
https://github.com/apache/spark/pull/15409#discussion_r83054921
--- Diff: python/pyspark/sql/dataframe.py ---
@@ -640,25 +640,24 @@ def join(self, other, on=None, how=None):
if on is not None and not isinstance(on, list):
on = [on]
- if on is None or len(on) == 0:
- jdf = self._jdf.crossJoin(other._jdf)
- elif isinstance(on[0], basestring):
- if how is None:
- jdf = self._jdf.join(other._jdf, self._jseq(on), "inner")
+ if on is not None:
+ if isinstance(on[0], basestring):
+ on = self._jseq(on)
else:
- assert isinstance(how, basestring), "how should be
basestring"
- jdf = self._jdf.join(other._jdf, self._jseq(on), how)
+ assert isinstance(on[0], Column), "on should be Column or
list of Column"
+ if len(on) > 1:
+ on = reduce(lambda x, y: x.__and__(y), on)
--- End diff --
I could fix this too.
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