[GitHub] [incubator-hudi] nandini57 commented on issue #1582: [SUPPORT] PreCombineAndUpdate in Payload

[GitBox <gi...@apache.org>]

nandini57 commented on issue #1582:
URL: https://github.com/apache/incubator-hudi/issues/1582#issuecomment-622970820


   My apologies. Let me try to explain.If i don't upsert the data with each batch where applicable,when i query back the table,it will have duplicates as batch  "n" need to have data from batch  "n-1","n-2" ... I need to do group by upsertKey ..max(commit_time) to get the latest view of data.Doing a group by with each read won't scale .
   
   Instead of this, if i can preserve the current_val with deleted identifier in CustomPayload and also return both incoming and current payload in Combine And Get, i can preserve the required data for audit and also read can filter out records with deleted identifier.
   
   Does this make sense.Any other ideas? Possibly ,making the copyOldRecord a configurable property with default as false if that doesn't impact anything else
   


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