[Spark] Enable column mapping removal feature flag #3114
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<!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [x] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description Enable column mapping removal feature flag to allow user to run ``` ALTER TABLE table_name SET TBLPROPERTIES ('delta.columnMapping.mode' = 'none') ``` or ``` ALTER TABLE table_name UNSET TBLPROPERTIES ('delta.columnMapping.mode') ``` to remove column mapping property from their table and rewrite physical files to match the logical column names. Also allows column mapping feature to be dropped with ``` ALTER TABLE <table_name> DROP FEATURE columnMapping ``` <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> ## How was this patch tested? existing tests <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> Yes Allows user to run ``` ALTER TABLE table_name SET TBLPROPERTIES ('delta.columnMapping.mode' = 'none') ``` or ``` ALTER TABLE table_name UNSET TBLPROPERTIES ('delta.columnMapping.mode') ``` to remove column mapping from a Delta table. Previously, this commands would not run successfully and would return an exception stating such an operation is prohibited. Also allows column mapping feature to be dropped with ``` ALTER TABLE <table_name> DROP FEATURE columnMapping ```
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Which Delta project/connector is this regarding?
Description
Enable column mapping removal feature flag to allow user to run
or
to remove column mapping property from their table and rewrite physical files to match the logical column names.
Also allows column mapping feature to be dropped with
How was this patch tested?
existing tests
Does this PR introduce any user-facing changes?
Yes
Allows user to run
or
to remove column mapping from a Delta table.
Previously, this commands would not run successfully and would return an exception stating such an operation is prohibited.
Also allows column mapping feature to be dropped with