sap1ens opened a new issue, #834:
URL: https://github.com/apache/arrow-java/issues/834
### Describe the bug, including details regarding any error messages,
version, and platform.
When using Avro's `ValidatingDecoder`, any schema with a nullable field
fails with the following exception:
```
Exception in thread "main" org.apache.avro.AvroTypeException: Attempt to
process a int when a union was expected.
at org.apache.avro.io.parsing.Parser.advance(Parser.java:91)
at
org.apache.avro.io.ValidatingDecoder.readInt(ValidatingDecoder.java:81)
at
org.apache.arrow.adapter.avro.consumers.AvroNullableConsumer.consume(AvroNullableConsumer.java:44)
```
Reason: `AvroNullableConsumer` uses `readInt` to read the index, but it
should use `readIndex` instead. It's irrelevant in case of a `BinaryDecoder`,
for example (`readIndex` is the same as `readInt`), but `ValidatingDecoder`s
and any Decoders based on that have different logic.
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