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mtth avatar mtth commented on May 28, 2024

Hey! This is related to how decoded unions are represented. The default UnionType expects its values to be wrapped inside objects (similarly to their JSON representation). So for your example, the value ({values: ['test']}) you are passing should be transformed to {values: [{'string': 'test'}]}.

This is required to correctly serialize all union values. Here's an example of an ambiguous case otherwise:

var type = avro.parse(['int', 'float']);
var buf = type.toBuffer(2); // Should 2 be serialized as an integer or a float?

The python implementation can cause corruption (and also requires a linear scan of branches during serialization, which is slow). If you're curious, you can take a look at #16 for more context.

Not all unions lead to ambiguous cases though so I'm actually working on adding an option to represent decoded union values without the wrapping object when possible.

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mladerman avatar mladerman commented on May 28, 2024

Ah, perfect, thank you!

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