[GitHub] [incubator-doris] wangbo commented on issue #4928: [Proposal] Cost base optimize for conditions

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

wangbo commented on issue #4928:
URL: https://github.com/apache/incubator-doris/issues/4928#issuecomment-730282616


   It looks more like based on ```Operation Type``` and ```Data Type``` .
   Where is ```Based on cost``` reflected?
   I wonder whether we need to collect column's statistics info,such as columns's cardinality.
   Eg, even ```key_varchar in ```  is more expensive than EQ, but ```key_varchar``` has higher selectivity ,so we can put ```key_varchar``` ahead


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