[GitHub] [arrow] seddonm1 commented on pull request #8880: ARROW-10674: [Rust][Parquet] Add Decimal to ArrayBuilderReader

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seddonm1 commented on pull request #8880:
URL: https://github.com/apache/arrow/pull/8880#issuecomment-742764143


   The TPC-H queries are fairly basic but do decimal operations like these which I think are all decimal type: 
   
   ```sql
                   sum(l_quantity) as sum_qty,
                   sum(l_extendedprice) as sum_base_price,
                   sum(l_extendedprice * (1 - l_discount)) as sum_disc_price,
                   sum(l_extendedprice * (1 - l_discount) * (1 + l_tax)) as sum_charge,
                   avg(l_quantity) as avg_qty,
                   avg(l_extendedprice) as avg_price,
                   avg(l_discount) as avg_disc,
   ```


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