fuwhu opened a new pull request #26617: [SPARK-29979][SQL]Add basic/reserved property key constants in Table and SupportsNamespaces URL: https://github.com/apache/spark/pull/26617 ### What changes were proposed in this pull request? Add "comment" and "location" property key constants in Table and SupportNamespaces. And update code of implementation classes to use these constants instead of hard code. ### Why are the changes needed? Currently, some basic/reserved keys (eg. "location", "comment") of table and namespace properties are hard coded or defined in specific logical plan implementation class. These keys can be centralized in Table and SupportsNamespaces interface and shared across different implementation classes. ### Does this PR introduce any user-facing change? no ### How was this patch tested? Existing unit test
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