[GitHub] [avro] unchuckable commented on pull request #973: AVRO-2952: AvroDatatype

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

unchuckable commented on pull request #973:
URL: https://github.com/apache/avro/pull/973#issuecomment-744046565


   While I am no maintainer, I'll still offer my two cents from a short browse over what seems like a very interesting PR.
   
   This PR features an interesting approach to extending the handling of logical types. I like the general concept, but I personally feel that the code as presented is not as mature (or I don't understand it enough) as I'd like to see code that's merged into my favourite serialization framework ;)
   
   Points that should be addressed in my eyes:
   * the methods `public String toString()` and `public String toString(StringBuilder, Value)` imply they do something similar, but actually don't
   * the methods `public int hashCode()` are not implemented consistently, and where they are, they all return 1 which leads to bad hashmapping in cases where that might ever be used
   * `public boolean equals()` feels odd where it addresses Arrays and Maps
   * instances of override functions that only call their super version are redundant
   * it is unclear to me why some effectively static final fields are only set as static (leads to short lived wtfs when reading)
   * `getRecommendedSchema` returns null in some cases (arrays, maps, records), but neither interface or javadoc specify that
   
   I wonder if it would be possible to reduce the PR size a lot by using a parameterized base class for the most common datatypes and only override code that actually changes between the different classes. (functions like `getBackingType`, `getRecommendedSchema`, `getAvroType` and `getConvertedType` are basically the same in all cases)
   
   Again, as I said above, I like the general concept, and I am sure the presented PR can be "prettied up" quite a bit to be easier readable and understandable.
   


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