[GitHub] [incubator-hudi] symfrog commented on issue #1480: [SUPPORT]

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

symfrog commented on issue #1480: [SUPPORT]
URL: https://github.com/apache/incubator-hudi/issues/1480#issuecomment-608114543
 
 
   @bvaradar the purpose would be in the case of an unavoidable schema evolution that is not backward compatible, we would maintain the original tables for some period of time to allow for downstream clients to migrate to the new set of tables. 
   
   The new set of tables would be a transformation (e.g. rename columns) of the original tables. 
   
   However, we would like downstream clients to be able to use their instant values to continue to do incremental pulls without receiving data they have already processed when they switch over to the new tables (conforming to the new schema). 
   
   The new tables would be created during an initialization process to ingest all the data from the old tables and transform it to the new schema. After this initialization process, we would like the instant timestamps to be the same in the new target tables after the transformation so that downstream clients can continue to use their existing instant values while performing incremental pull queries. 

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