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[SPARK-2871] [PySpark] add RDD.lookup(key) #2093

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davies wants to merge 6 commits into from
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[SPARK-2871] [PySpark] add RDD.lookup(key) #2093

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eb1305d
add RDD.lookup(key)
davies Aug 22, 2014
be0e8ba
fix preservesPartitioning
davies Aug 23, 2014
0f1bce8
add test case for lookup()
davies Aug 23, 2014
c6390ea
address all comments
davies Aug 24, 2014
2871b80
Merge branch 'master' into lookup
davies Aug 24, 2014
1789cd4
`f` in foreach could be generator or not.
davies Aug 24, 2014
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add test case for lookup()
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@davies
davies committed Aug 23, 2014
commit 0f1bce8bbf6ca8ccec04f7030707f5a01f3a15ae
2 changes: 2 additions & 0 deletions python/pyspark/rdd.py
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Expand Up @@ -1711,6 +1711,8 @@ def lookup(self, key):
>>> sorted = rdd.sortByKey()
>>> sorted.lookup(42) # fast
[42]
>>> sorted.lookup(1024)
[]
"""
self = self.filter(lambda (k, v): k == key).values()
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@JoshRosen JoshRosen Aug 24, 2014

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This reassignment to self seems potentially confusing. Could you use a different name for the filtered RDD, such as filtered? I think even a one-letter variable name, like f, is preferable to re-assigning self.


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