Github user BryanCutler commented on the issue:
https://github.com/apache/spark/pull/12790
Bumping this, there has been some discussion but hopefully we can get a
consensus on constructing a pipeline with no stages (should be an identity
trans). Looking at the current API, it seems like the following should be
supported:
1) `pl = Pipeline(stages=[])`
2) `pl = Pipeline(stages=None)`
3) `pl = Pipeline()`
However, only 1) works, while the others will lead to a cryptic error when
calling `fit`. I think 1) & 3) should be supported, I am indifferent about 2).
Regardless of what's decided, this code should be cleaned up because the
current checks don't do anything, there is no default value, and `getStages` is
missing a return path.
cc @mengxr @jkbradley @MLnick
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