Nathan Daniels created AVRO-3254:
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Summary: .NET - Automatically scale AvroDecimal values when
serializing
Key: AVRO-3254
URL: https://issues.apache.org/jira/browse/AVRO-3254
Project: Apache Avro
Issue Type: Improvement
Components: csharp
Reporter: Nathan Daniels
*Problem*
When serializing an `AvroDecimal`, the Decimal class's `ConvertToBaseValue`
method will throw an exception if the scale of the decimal does not exactly
match the scale defined in the schema.
The exception goes something like
`The decimal value has a scale of {scale} which cannot be encoded against a
logical 'decimal' with a scale of {logicalScale}`
I feel this is far too restrictive and unintuitive from a usability
perspective. For example, it is not possible to serialize the c# decimal
`1.0m` into a schema field of precision 20 and scale 2, because `1.0` has a
"scale" of 1. Instead, the user must force the decimal to be `1.00m` if they
want to serialize despite the fact that 1.0 and 1.00 are the same exact real
number. Now the user needs to be aware of the scale defined in the schema
before attempting to serialize.
*Solution?*
I propose the `Decimal` and `AvroDecimal` classes be smart enough to re-scale a
value into the scale specified in the schema if doing so would not result in
data loss. It is relatively trivial operation to do so, and would make using
`AvroDecimal` much easier.
I will open a PR with my proposed improvement, but essentially the line
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