[PR] [core] support adding blob column through comments [paimon]

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

steFaiz opened a new pull request, #7996:
URL: https://github.com/apache/paimon/pull/7996

   ### Purpose
   This PR introduces a comment format to mark an adding column as BlobType. So that these engines which do not have BlobType can also add blob columns. 
   The rule is: 
   1. define 2 directives: `__BLOB_FIELD`, `__BLOB_DESCRIPTOR_FIELD`
   2. user comments are seperated by `;`: e.g. `__BLOB_FIELD; this is a blob field`, The starting directives will be trimmed.
   3. blob-field and blob-descriptor-field is immutable, and will be atomically modified during Alter Table Add Column.
   
   
   ### Tests
   ITCases and UnitTests
   


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Re: [PR] [core] support adding blob column through comments [paimon]

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

JingsongLi merged PR #7996:
URL: https://github.com/apache/paimon/pull/7996


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