zeroshade commented on issue #43956:
URL: https://github.com/apache/arrow/issues/43956#issuecomment-2869161700

   The types are in Arrow as mentioned by the types (you can see the first two 
sub-issues checked!)
   
   What's missing are Acero and other compute kernel support (such as some of 
the casting kernels or otherwise. only minimal casting was added to enable 
pyarrow support of the types).
   
   And the current Parquet implementation doesn't yet use the smaller bitwidths 
for Decimal32/64 I don't think (but am unsure). At the moment it just needs 
someone to write the code to add it.


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