a2l007 commented on a change in pull request #9449:
URL: https://github.com/apache/druid/pull/9449#discussion_r432592527



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File path: docs/ingestion/native-batch.md
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@@ -1310,6 +1311,43 @@ A spec that applies a filter and reads a subset of the 
original datasource's col
 This spec above will only return the `page`, `user` dimensions and `added` 
metric.
 Only rows where `page` = `Druid` will be returned.
 
+### Sql Input Source

Review comment:
       @jihoonson I have added more details related to this in the docs. Please 
take a look. Since this is a one time ingestion from rdbms, updates to the 
source db data for a specific interval would require a new sql ingestion task 
be spawned for the same interval which will replace the old segments.
   
   By the way, I would like to add a continuous ingestion from RDBMS feature as 
well which could use the indexing service with a RDBMS supervisor. Do you think 
this would be a useful feature?
   




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