Critical Description
Consider below 2 schemas:
Schema 1:
[
{
"type": "record",
"name": "rec1",
"fields": [
{
"name": "age",
"type": "long"
}
]
},
{
"type": "record",
"name": "rec2",
"fields": [
{
"name": "username",
"type": "string"
}
]
}
]
Schema 2:
[
{
"type": "record",
"name": "rec1",
"fields": [
{
"name": "age",
"type": "long"
},
{
"name": "address",
"type": "string"
}
]
},
{
"type": "record",
"name": "rec2",
"fields": [
{
"name": "username",
"type": "string"
}
]
}
]
The rec1 field in these 2 unions are not compatible, because the address field of rec1 in the second one is not nullable. However, if we check them with validate like below, validator doesn't return any error:
final SchemaValidator backwardValidator = new SchemaValidatorBuilder().canReadStrategy().validateLatest(); final Schema schema1 = new Schema.Parser().parse(schema1Str); final Schema schema2 = new Schema.Parser().parse(schema2Str); backwardValidator.validate(schema2, Arrays.asList(schema1));
