[GitHub] [doris] bobhan1 commented on issue #18501: [Enhancement] add auto increment id support

["bobhan1 (via GitHub)" <gi...@apache.org>]

bobhan1 commented on issue #18501:
URL: https://github.com/apache/doris/issues/18501#issuecomment-1563767938

   I think we should put the process of filling values for auto increment cols in XXXScaner instead of in `VOlapTable::sink()`, bacause `VOlapTable` lacks some neccessary information here. 
   For example, if the user add parameter `-H columns: c1, c2=some_func(c1)` in a stream load task, where `c1` is an auto increment column. We can only calculate the values of `c2` in `VFileScanner::_fill_missing_columns()` becasue `VExprContex` for column transformation is only stored in `VFileScanner` and `VOlapTable` doesn't have the information about this. 
   So for load task, the process of generating and filling auto increment values should be in `XXXScanner::_get_block_impl()`.


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