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https://issues.apache.org/jira/browse/AVRO-3668?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Aaron Spiegel updated AVRO-3668:
--------------------------------
Description:
The idiomatic way to create type unions in Rust is to create a non-unit Enum
with unnamed fields. As a user, I would like to derive an Avro schema from this
type of object:
{code:java}
#[derive(AvroSchema)]
enum MyEnum {
AsAString(String),
AsAnInt(i32),
}
#[derive(AvroSchema)]
struct MyStuct {
my_enum: MyEnum,
}{code}
Which would create a schema of:
{code:java}
{
"name" : "my_struct",
"type" : "record",
"fields" :
[
{
"name" : "my_enum",
"type" : [
"string",
"int"
]
}
]
}{code}
Rust also supports named fields for structure types, and multi-field unnamed,
similar to tuple types:
{code:java}
#[derive(AvroSchema(union)]
enum MyEnum {
MultiFieldUnnamed(String, i32),
NamedField: {
value: String,
count: i32,
}
}
{code}
While the Rust enum supports named and multi-field unnamed variants to
represent embedded structs, tuple-like and a mix of unit fields, named, and
unnamed fields. I would consider these variations outside the scope of this
issue, since the formats may not be easily interoperable with other languages.
In the future, these variations may also be supported by the AvroSchema derive
with embedded records similar to the approach describe in AVRO-3646.
was:
The idiomatic way to create type unions in Rust is to create a non-unit Enum
with unnamed fields. As a user, I would like to derive an Avro schema from this
type of object:
{code:java}
#[derive(AvroSchema)]
enum MyEnum {
AsAString(String),
AsAnInt(i32),
}
#[derive(AvroSchema)]
struct MyStuct {
my_enum: MyEnum,
}{code}
Which would create a schema of:
{code:java}
{
"name" : "my_struct",
"type" : "record",
"fields" :
[
{
"name" : "my_enum",
"type" : [
"string",
"int"
]
}
]
}{code}
Rust also supports named fields for structure types, and multi-field unnamed,
similar to tuple types:
{code:java}
#[derive(AvroSchema)]
enum MyEnum {
MultiFieldUnnamed(String, i32),
NamedField: {
value: String,
count: i32,
}
}
{code}
While the Rust enum supports named and multi-field unnamed variants to
represent embedded structs, tuple-like and a mix of unit fields, named, and
unnamed fields. I would consider these variations outside the scope of this
issue, since the formats may not be easily interoperable with other languages.
In the future, these variations may also be supported by the AvroSchema derive
with embedded records similar to the approach describe in AVRO-3646.
> Rust AvroSchema derive should support non-unit enums
> ----------------------------------------------------
>
> Key: AVRO-3668
> URL: https://issues.apache.org/jira/browse/AVRO-3668
> Project: Apache Avro
> Issue Type: New Feature
> Components: rust
> Reporter: Aaron Spiegel
> Priority: Major
>
> The idiomatic way to create type unions in Rust is to create a non-unit Enum
> with unnamed fields. As a user, I would like to derive an Avro schema from
> this type of object:
> {code:java}
> #[derive(AvroSchema)]
> enum MyEnum {
> AsAString(String),
> AsAnInt(i32),
> }
> #[derive(AvroSchema)]
> struct MyStuct {
> my_enum: MyEnum,
> }{code}
> Which would create a schema of:
> {code:java}
> {
> "name" : "my_struct",
> "type" : "record",
> "fields" :
> [
> {
> "name" : "my_enum",
> "type" : [
> "string",
> "int"
> ]
> }
> ]
> }{code}
>
> Rust also supports named fields for structure types, and multi-field unnamed,
> similar to tuple types:
> {code:java}
> #[derive(AvroSchema(union)]
> enum MyEnum {
> MultiFieldUnnamed(String, i32),
> NamedField: {
> value: String,
> count: i32,
> }
> }
> {code}
> While the Rust enum supports named and multi-field unnamed variants to
> represent embedded structs, tuple-like and a mix of unit fields, named, and
> unnamed fields. I would consider these variations outside the scope of this
> issue, since the formats may not be easily interoperable with other
> languages. In the future, these variations may also be supported by the
> AvroSchema derive with embedded records similar to the approach describe in
> AVRO-3646.
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