Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/2136#discussion_r67719598
--- Diff:
flink-libraries/flink-python/src/main/python/org/apache/flink/python/api/flink/plan/DataSet.py
---
@@ -572,6 +572,41 @@ def set_parallelism(self, parallelism):
self._info.parallelism.value = parallelism
return self
+ def count_elements_per_partition(self):
+ class CountElementsPerPartitionMapper(MapPartitionFunction):
+
+ def map_partition(self, iterator, collector):
+ counter = 0
+ for x in iterator:
+ counter += 1
+
+
collector.collect((self.context.get_index_of_this_subtask(), counter))
+ return self.map_partition(CountElementsPerPartitionMapper())
+
+ def zip_with_index(self):
+ element_count = self.count_elements_per_partition()
+ class ZipWithIndexMapper(MapPartitionFunction):
+ start = 0
--- End diff --
if we would start at -1 we wouldn't have to decrement it when collecting
the value
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