[PR] [core] Identifier can now recognize branch and system tables [paimon]

["tsreaper (via GitHub)" <gi...@apache.org>]

tsreaper opened a new pull request, #3862:
URL: https://github.com/apache/paimon/pull/3862

   ### Purpose
   
   In # we allow visit table branches by `$branch_`. Now an identifier may represent a data table, or a system table, or a table branch.
   
   In this PR, we add some methods in `Identifier` so that it can recognize branches and system tables. Catalogs will need these methods to get schemas, communicate with metastores, etc.
   
   ### Tests
   
   This is a refactor. Existing tests should cover the changes.
   
   ### API and Format
   
   `Identifier` is a public API. This PR adds some methods to the class.
   
   ### Documentation
   
   No new feature.
   


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Re: [PR] [core] Identifier can now recognize branch and system tables [paimon]

["JingsongLi (via GitHub)" <gi...@apache.org>]

JingsongLi merged PR #3862:
URL: https://github.com/apache/paimon/pull/3862


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