KevinLinGit opened a new issue #2027: unexpected UDF deduction
URL: https://github.com/apache/incubator-doris/issues/2027
 
 
   **Describe the bug**
   I have two udaf functions as follow:
   
   - STRING  topk(STRING, INT, INT, BIGINT)
   - STRING  topk(STRING, INT, INT, DOUBLE)
   
   Then, just explain sql "explain select topk(province_, 0, 5, 1) from test", 
you will get something as follow:
   
![image](https://user-images.githubusercontent.com/6179135/67253295-820c3800-f4a9-11e9-86d4-9b8ba25bc4bc.png)
   

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