melin commented on PR #114:
URL: 
https://github.com/apache/flink-connector-aws/pull/114#issuecomment-1901773568

   1、The tuncate table paramter is supported in the batch import scenario. If 
data exists in a table, duplicate data will be generated and the table must be 
cleared first
   2、Can upsert write data in Batch data import scenarios。
   
https://docs.aws.amazon.com/redshift/latest/dg/t_updating-inserting-using-staging-tables-.html


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