Github user gatorsmile commented on the issue:
    @rxin @wzhfy Just my 2 cents. To address @rxin 's comment, we can implement 
a built-in function, `compute_stats`, like what Hive does. The actual 
implementation of `AnalyzeColumnCommand` can be moved into this function. Then, 
most test cases can be refactored by verifying the correctness of 
`compute_stats`. The testing can be much simplified and the testing coverage 
can be further improved. 
    To implement `compute_stats`, we can use the Optimizer rule 
`ReplaceExpressions` to convert it to the actual expressions. 

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