paul-rogers commented on issue #13469:
URL: https://github.com/apache/druid/issues/13469#issuecomment-1381092126

   @andrisnoko notes:
   
   > QueryRequest should contain a queryId field for custom query ids
   
   This is an interesting suggestion! As it turns out, the product recently 
added a way to forbid custom query IDs. The reason is that, when fed to a 
metrics system, user-defined IDs often result in duplicate IDs, causing the 
results from multiple queries to be combined in misleading ways.
   
   Given a successful query, the response provides the query ID which can be 
used to locate information for that query.
   
   All that said, in the REST API, the custom query ID comes in via a query 
context parameter. The gRPC form also has a query context, so a custom query ID 
should "just work."


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