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## What changes were proposed in this pull request?
- Add tests covering different scenarios with qualified column names
- Please see Section 2 in the design doc for the various test scenarios [here](https://issues.apache.org/jira/secure/attachment/12854681/Design_ColResolution_JIRA19602.pdf)
- As part of SPARK-19602, changes are made to support three part column name. In order to aid in the review and to reduce the diff, the test scenarios are separated out into this PR.
## How was this patch tested?
- This is a **test only** change. The individual test suites were run successfully.
Author: Sunitha Kambhampati <skambha@us.ibm.com>
Closes #17067 from skambha/colResolutionTests.
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