liukun4515 edited a comment on issue #122:
URL: 
https://github.com/apache/arrow-datafusion/issues/122#issuecomment-975036335


   - [ ] create external csv table with decimal data type in SQL parse and 
logical plan.
   - [ ] decimal scalar #1393 
   - [ ] create table and select column with decimal datatype 
https://github.com/apache/arrow-datafusion/pull/1431
   - [ ] support aggregate function(example min,max,count,sum)
      - [ ] min/max https://github.com/apache/arrow-datafusion/pull/1407
      - [ ] sum/avg https://github.com/apache/arrow-datafusion/pull/1408
      - [ ] sum/avg overflow checker 
https://github.com/apache/arrow-datafusion/issues/1460
      - [ ] count/ApproxDistinct/ArrayAgg
      - [ ] coercion rule for aggregate function 
https://github.com/apache/arrow-datafusion/pull/1387
   - [ ] support try_cast,cast : (1) support in arrow-rs 
https://github.com/apache/arrow-rs/issues/1043 (2) support in datafusion 
https://github.com/apache/arrow-datafusion/issues/1443
   - [ ] support binary operator
       - [ ] comparison operation
       - [ ] use arrow-rs kernel to replace datafusion for gt,lt 
https://github.com/apache/arrow-rs/issues/959
       - [ ] binary coercion rules
   - [ ] SIMD in arrow-rs https://github.com/apache/arrow-rs/issues/1010
   - [ ] support expr evaluation (using in select, filter and other clause)
   - [ ] add document for promotion precision and scale 
https://github.com/apache/arrow-datafusion/issues/1461
   
   
   discussion about the result data type 
https://github.com/apache/arrow-datafusion/issues/1418


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