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Codec.map fails for keys of type java.lang.String #749
Description
Problem is similar to #64 but for Codec.map String keys.
Currently keys are only allowed to be of Utf8 type.
I have the following field schema derived from java class generated by avro java plugin:
{
"name": "recordsMap",
"type": {
"type": "map",
"values": "com.example.MapRecord",
"avro.java.string": "String"
}
}Standard vulcan map codec https://github.com/typelevel/vulcan/blob/main/modules/core/src/main/scala/vulcan/Codec.scala#L889 throws an exception in this case when deserializing a key:
Error decoding Map: Got unexpected map key with type java.lang.String, expected Utf8
Activity
vlovgr commentedon May 22, 2026
I'm guessing this is because of
"avro.java.string": "String"which says to useStringinstead ofUtf8for the keys. This is currently not supported. Feel free to take a stab at adding support.