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## What changes were proposed in this pull request?
This is 4th batch of test case for IN/NOT IN subquery. In this PR, it has these test files:
`in-set-operations.sql`
`in-with-cte.sql`
`not-in-joins.sql`
Here are the queries and results from running on DB2.
[in-set-operations DB2 version](https://github.com/apache/spark/files/772846/in-set-operations.sql.db2.txt)
[Output of in-set-operations](https://github.com/apache/spark/files/772848/in-set-operations.sql.db2.out.txt)
[in-with-cte DB2 version](https://github.com/apache/spark/files/772849/in-with-cte.sql.db2.txt)
[Output of in-with-cte](https://github.com/apache/spark/files/772856/in-with-cte.sql.db2.out.txt)
[not-in-joins DB2 version](https://github.com/apache/spark/files/772851/not-in-joins.sql.db2.txt)
[Output of not-in-joins](https://github.com/apache/spark/files/772852/not-in-joins.sql.db2.out.txt)
## How was this patch tested?
This pr is adding new test cases. We compare the result from spark with the result from another RDBMS(We used DB2 LUW). If the results are the same, we assume the result is correct.
Author: Kevin Yu <qyu@us.ibm.com>
Closes #16915 from kevinyu98/spark-18871-44.
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