Fix nullabilities of Join/Generate/Aggregate because:
- Output attributes of opposite side of OuterJoin should be nullable.
- Output attributes of generater side of Generate should be nullable if join is true and outer is true.
- AttributeReference of computedAggregates of Aggregate should be the same as aggregateExpression's.
- requires
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SPARK-2328 Add execution of `SHOW TABLES` before `TestHive.reset()`.
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- Resolved
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