CodeWithPravinMaske commented on PR #12597:
URL: https://github.com/apache/seatunnel/pull/12597#issuecomment-6129077944

   Thanks @DanielLeens for the re-review!
   
   1. **Oracle / PostgreSQL docs**: added the same NOT NULL sentence to the 
"unique non-primary column via `table-names-config.primaryKeys`" recipe in 
`Oracle-CDC.md` and `PostgreSQL-CDC.md` (en and zh). DB2, SQL Server and 
openGauss don't have that recipe.
   2. **Metadata query for real-PK tables**: I'd keep it as is for now. It's 
one `getColumns` call per table at split generation, next to the per-table 
metadata and min/max queries that `getSplitColumn` already runs, and a dialect 
with a cheaper source can override `isColumnNullable`. Happy to fetch the 
columns once per table in a follow-up if startup time on very large table lists 
becomes a concern.
   3. **Inline logger**: an interface can't hold a private logger field, and a 
`Logger` constant would become a public field of the dialect SPI. So I left the 
lookup inline. It only runs on the rare metadata-miss path, right before 
falling back to the parsed column.
   


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