Evan Blackwell created AVRO-3786:
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Summary: [Rust] Deserialization results in FindUnionVariant error
if the writer and reader have the same symbol but at different positions
Key: AVRO-3786
URL: https://issues.apache.org/jira/browse/AVRO-3786
Project: Apache Avro
Issue Type: Bug
Components: rust
Reporter: Evan Blackwell
When calling from_avro_datum with a reader schema that has the same enum symbol
but in a different position as the writer schema, a FindUnionVariant error
occurs. The value in the message is available in both schemas. The enum is
defined elsewhere in the schema, so it's worth checking if the problem is with
the reference type or the enum itself.
Sample test
{code:java}
#[test]
fn deserialize_union_with_different_enum_order() -> TestResult {
#[derive(Debug, PartialEq, Eq, Clone, serde::Deserialize,
serde::Serialize)]
pub struct BarUseParent {
#[serde(rename = "barUse")]
pub bar_use: Bar,
}
#[derive(Debug, PartialEq, Eq, Hash, PartialOrd, Ord, Clone,
serde::Deserialize, serde::Serialize)]
pub enum Bar {
#[serde(rename = "bar0")]
Bar0,
#[serde(rename = "bar1")]
Bar1,
#[serde(rename = "bar2")]
Bar2,
}
#[derive(Debug, PartialEq, Eq, Clone, serde::Deserialize,
serde::Serialize)]
pub struct Foo {
#[serde(rename = "barInit")]
pub bar_init: Bar,
#[serde(rename = "barUseParent")]
pub bar_use_parent: Option<BarUseParent>,
}
let writer_schema = r#"{
"type": "record",
"name": "Foo",
"fields":
[
{
"name": "barInit",
"type":
{
"type": "enum",
"name": "Bar",
"symbols":
[
"bar0",
"bar1",
"bar2"
],
"default": "bar0"
}
},
{
"name": "barUseParent",
"type": [
"null",
{
"type": "record",
"name": "BarUseParent",
"fields": [
{
"name": "barUse",
"type": "Bar"
}
]
}
]
}
]
}"#;
let reader_schema = r#"{
"type": "record",
"name": "Foo",
"fields":
[
{
"name": "barInit",
"type":
{
"type": "enum",
"name": "Bar",
"symbols":
[
"bar1"
],
"default": "bar1"
}
},
{
"name": "barUseParent",
"type": [
"null",
{
"type": "record",
"name": "BarUseParent",
"fields": [
{
"name": "barUse",
"type": "Bar"
}
]
}
]
}
]
}"#;
let writer_schema = Schema::parse_str(writer_schema)?;
let foo = Foo {
bar_init: Bar::Bar1,
bar_use_parent: Some(BarUseParent { bar_use: Bar::Bar1} ),
};
let avro_value = crate::to_value(foo)?;
assert!(
avro_value.validate(&writer_schema),
"value is valid for schema",
);
let datum = crate::to_avro_datum(&writer_schema, avro_value)?;
let mut x = &datum[..];
let reader_schema = Schema::parse_str(reader_schema)?;
let deser_value = crate::from_avro_datum(&writer_schema, &mut x,
Some(&reader_schema))?;
match deser_value {
types::Value::Record(fields) => {
assert_eq!(fields.len(), 2);
assert_eq!(fields[0].0, "barInit");
assert_eq!(fields[0].1, types::Value::Enum(1,
"bar1".to_string()));
assert_eq!(fields[1].0, "barUseParent");
// TODO: assert barUseParent value
}
_ => panic!("Expected Value::Record"),
} Ok(())
} Ok(()) } {code}
Resulting error:
{code:java}
apache_avro::error::Error: Could not find matching type in union {code}
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