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[SPARK-14691][SQL] Simplify and Unify Error Generation for Unsupporte…
…d Alter Table DDL #### What changes were proposed in this pull request? So far, we are capturing each unsupported Alter Table in separate visit functions. They should be unified and issue the same ParseException instead. This PR is to refactor the existing implementation and make error message consistent for Alter Table DDL. #### How was this patch tested? Updated the existing test cases and also added new test cases to ensure all the unsupported statements are covered. Author: gatorsmile <gatorsmile@gmail.com> Author: xiaoli <lixiao1983@gmail.com> Author: Xiao Li <xiaoli@Xiaos-MacBook-Pro.local> Closes #12459 from gatorsmile/cleanAlterTable.
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