liukun4515 commented on issue #2320:
URL: https://github.com/apache/arrow-rs/issues/2320#issuecomment-1207205732

   > I think it would help to take a step back here, as I at least am very 
confused as to what is being validated when. For most array types we have an 
invariant that `ArrayData` only contains valid data, this means we can elide 
validation on access. This does not appear to be the case for `DecimalArray`, 
which I personally think is a bug.
   
   We can get the decimal array from decimal array builder.
   When appending a decimal value to the builder, we need to verify it.
   
   
   But in the arrow-rs, I find some case which we can skip the validation.For 
example, reading decimal value from parquet file(INT32,INT64, OR byte array), 
taking data from decimal array. We can refile these cases.
   
   
   


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