tokoko opened a new pull request, #474:
URL: https://github.com/apache/arrow-adbc/pull/474

   Fixes https://github.com/apache/arrow-adbc/issues/471. 
   
   - ObjectMetadataBuilder has been partly rewritten to use Writers instead of 
directly writing to Vectors, allowing to get rid of much of row index 
accounting.
   - ObjectMetadataBuilder handles UNIQUE constraints.
   - Added tests for constraints. Right now SQL statements are issued to create 
PK and FK keys directly without any changes in Quirks. Seems to be sufficient 
for both Derby and Postgres. Probably will have to be changed for more 
complicated scenarios.


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