Synchronize before copying the output items
When driver creation fails properly fire failed event
Add force started splits to task handle so they can be destroyed
Add close to ExchangeOperator to assure ExchangeClient is closed
Optimize DomainTranslation of BETWEEN ranges
Simplify the effective predicate from table scan partitions
Fix overflow bug in HashPagePartitionFunction
Do not close output buffers on failure
Window function should be able to run on distributed nodes
Update FunctionAssertions for UDFs
Merge pull request #4 from facebook/master

Sync with upstream