kangkaisen opened a new pull request #255: Simplify constant Expr URL: https://github.com/apache/incubator-doris/pull/255 Simplify constant Expr could improve Partition Pruning. The examples for constant Expr Simplifing: ``` 1 + 1 + 1 --> 3 date_add('2018-08-08', 1) --> 2018-08-09 year('2018-07-24')*12 + month('2018-07-24') -> 24223 ``` This implementation VS Impala implementation: The prons: **No RPC, the performance is better.** The cons: **Need to implement these functions in FE again, which need a lot of work, but we could implement these functions one by one and according to the users need like String functions.**
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