Github user greghogan commented on the pull request:
https://github.com/apache/flink/pull/1680#issuecomment-187258482
Unprobed, spilled partitions are now retained when performing a build-side
outer join (and still discarded in all other cases).
When these unprobed, spilled partitions are loaded by
`MutableHashTable.prepareNextPartition` we simply create an iterator over the
spilled segments which are read by the appropriate HashJoinIterator in a single
loop.
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