[GitHub] [incubator-doris] morningman edited a comment on issue #1825: HLL support default value

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morningman edited a comment on issue #1825: HLL support default value
URL: https://github.com/apache/incubator-doris/pull/1825#issuecomment-533766895
 
 
   @HangyuanLiu I think using `empty_hll()` is more reasonable. If business A does not care not column `uv2`, It should leave `uv2` unchanged by explicitly assigning a function means `unchanged`, which is what `empty_hll()` will do.
   
   If user assign nothing to HLL column, HLL column's content will be undefined. Because HLL is not like other types of column, which can be filled by default value or null.
   
   `empty_hll()` to HLL is like `0` to SUM.
   
   And also, should will add a function `empty_bitmap()` for BITMAP column? @kangkaisen 

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