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HIVE-28280: SemanticException when querying VIEW with DISTINCT clause #6103

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HIVE-28280: SemanticException when querying VIEW with DISTINCT clause #6103

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What changes were proposed in this pull request?

Earlier we expected a view's logical plan to always have a HiveProject as its top node. But we can have HiveSortLimit too if the original view definition has a limit.
We can add a case for SingleRel and check that its getInput() returns a HiveProject, and then the code can work as before.

Why are the changes needed?

We get an error as described in https://issues.apache.org/jira/browse/HIVE-28280, https://issues.apache.org/jira/browse/HIVE-21163

Does this PR introduce any user-facing change?

No

How was this patch tested?

mvn test -pl itests/qtest -Pitests -Dtest=TestMiniLlapCliDriver -Dtest.output.overwrite=true -Dqfile=view_top_relnode_not_project_authorization.q

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