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## What changes were proposed in this pull request? The design details is attached to the JIRA issue [here](https://drive.google.com/file/d/1zKm3aNZ3DpsqIuoMvRsf0kkDkXsAasxH/view) High level overview of the changes are: - Enhance the qualifier to be more than one string - Add support to store the qualifier. Enhance the lookupRelation to keep the qualifier appropriately. - Enhance the table matching column resolution algorithm to account for qualifier being more than a string. - Enhance the table matching algorithm in UnresolvedStar.expand - Ensure that we continue to support select t1.i1 from db1.t1 ## How was this patch tested? - New tests are added. - Several test scenarios were added in a separate [test pr 17067](https://github.com/apache/spark/pull/17067). The tests that were not supported earlier are marked with TODO markers and those are now supported with the code changes here. - Existing unit tests ( hive, catalyst and sql) were run successfully. Closes #17185 from skambha/colResolution. Authored-by: Sunitha Kambhampati <skambha@us.ibm.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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