PIG-4226: Upgrade Tez to 0.5.1

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PIG-4219: When parsing a schema, pig drops tuple inside of Bag if it contains only one field

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PIG-4199: Mapreduce ACLs should be translated to Tez ACLs (rohini)

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PIG-4227: Streaming Python UDF handles bag outputs incorrectly (cheolsoo)

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PIG-3979: group all performance, garbage collection, and incremental aggregation

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PIG-4230: Documentation fix: first nested foreach example is incomplete

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PIG-2834: MultiStorage requires unused constructor argument

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PIG-4181: Cannot launch tez e2e test on Windows

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PIG-4151: Pig Cannot Write Empty Maps to HBase

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PIG-4227: Streaming Python UDF handles bag outputs incorrectly (PIG-4227-2.patch)

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Rollback PIG-3979: group all performance, garbage collection, and incremental aggregation

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PIG-4238: Property 'pig.job.converted.fetch' should be unset when fetch finishes

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PIG-4184: UDF backward compatibility issue after POStatus.STATUS_NULL refactory

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PIG-4039: New interface for resetting static variables for jvm reuse (rohini)

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PIG-3861: duplicate jars get added to distributed cache (chitnis via rohini)

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PIG-3456: Reduce threadlocal conf access in backend for each record (rohini)

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PIG-4246: HBaseStorage should implement getShipFiles (rohini)

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PIG-3456: Reduce threadlocal conf access in backend for each record (PIG-3456-fixtest.patch)

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PIG-3861: duplicate jars get added to distributed cache (PIG-3861-fixtest.patch)

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PIG-4241: Auto local mode mistakenly converts large jobs to local mode when
using with Hive tables (cheolsoo)


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