heronshoes opened a new pull request, #15089:
URL: https://github.com/apache/arrow/pull/15089
### What I did
* Add `Table#column_names`.
* Returns `columns.map(&:name)`.
* Add tests for the tables that have unique keys and same keys.
* Add document.
### What I did'nt
* Check whole code to be replaced for it.
### What I checked
* It works as a method Table#keys in RedAmber using refinements.
### Notes for reviewers
* I will search the code which should be replaced if reviewer requested me.
### Related Issue
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