[GitHub] [incubator-doris] imay opened a new pull request #2127: Support aggregation type of REPLACE_IF_NOT_NULL

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

imay opened a new pull request #2127: Support aggregation type of REPLACE_IF_NOT_NULL
URL: https://github.com/apache/incubator-doris/pull/2127
 
 
   Some use has the requirment that only some of columns will be update in
   one load operation, and others will retain as original. However, Doris
   can't handle this situation, because user must specify value for all
   columns. Then if a column aggregation method is REPLACE, use must query
   original value to overwrite it. This often needs some work for user to
   do.
   
   If this CL is applied, user can use REPLACE_IF_NOT_NULL instead of
   REPLACE. Then when load data to table, if user don't intent to change
   value of this column, user can specify NULL for this column. Doris will
   retain original value for this column.
   
   For #2117 

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