AVRO-4135: [Java] JSON decoding unqualified union types #3374
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Support unqualified type references for unions when decoding them from json. AVRO-2287 makes it unclear if type reference for a JSON encoded union needs to be qualified or not. Today all encoders use the fully qualified types except the C JSON encoder which uses the unqualified type. In this patch we make the java JSON Decoder more lenient and let it fallback to unqualified types names when no qualified type name matches. Which matches the behavior currently implemented in the Javascript Json decoder. This patch is an alternative for apache#3373 where it is proposed to update the C library instead.
opwvhk
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May 29, 2025
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Support unqualified type references for unions when decoding them from json.
AVRO-2287 makes it unclear if type reference for a JSON encoded union needs to be qualified or not.
Today all encoders use the fully qualified types except the C JSON encoder which uses the unqualified type.
In this patch we make the java JSON Decoder more lenient and let it fallback to unqualified types names when no qualified type name matches. Which matches the behavior currently implemented in the Javascript Json decoder.
This patch is an alternative for #3373 where it is proposed to update the C library instead.
Verifying this change
This change added tests and can be verified as follows: run newly added test:
org.apache.avro.io.TestJsonDecoder#testUnionTypeQualificationDocumentation