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https://issues.apache.org/jira/browse/AVRO-1763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Thiruvalluvan M. G. updated AVRO-1763:
--------------------------------------
Component/s: spec
> Avro Schema Generator to handle polymorphic types
> -------------------------------------------------
>
> Key: AVRO-1763
> URL: https://issues.apache.org/jira/browse/AVRO-1763
> Project: Apache Avro
> Issue Type: Improvement
> Components: spec
> Affects Versions: 1.9.0
> Reporter: Qiangqiang Shi
> Priority: Major
>
> Inheritance and polymorphism are widely used in Java libraries. If multiple
> sophisticated Avro schema generator can be added to Avro, users can generate
> Avro schema easily for classes in complex context, third-party code and
> legacy code.
> For example, for the following class:
> {code:java}
> public class TestReflectPolymorphismData {
> {
> public static class SuperclassA1 {
> private String SuperclassA1;
> }
> public static class SubclassA1 extends SuperclassA1 {
> private String SubclassA1;
> }
> public static class SubclassA2 extends SuperclassA1 {
> private String SubclassA2;
> }
> public static class SuperB1 {
> private SubclassA1 SubclassA1;
> private List<SubclassA2> SubclassA2List;
> private Map<String, SuperclassA1> stringSuperclassA1Map;
> private Map<Integer, SuperclassA1> integerSuperclassA1Map;
> }
> }
> }
> {code}
> It'll be good if Avro can provide a schema generator to generate a schema
> like the following automatically for class SuperB1 :
> {code:java}
> {
> "type": "record",
> "name": "SuperB1",
> "namespace": "org.apache.avro.reflect.TestReflectPolymorphismData$",
> "fields": [
> {
> "name": "SubclassA1",
> "type": {
> "type": "record",
> "name": "SuperclassA1",
> "fields": [
> {
> "name": "SuperclassA1",
> "type": "string"
> },
> {
> "name": "SuperclassA1Subclasses",
> "type": [
> "null",
> {
> "type": "record",
> "name": "SubclassA1",
> "fields": [
> {
> "name": "SubclassA1",
> "type": "string"
> }
> ]
> },
> {
> "type": "record",
> "name": "SubclassA2",
> "fields": [
> {
> "name": "SubclassA2",
> "type": "string"
> }
> ]
> }
> ]
> }
> ]
> }
> },
> {
> "name": "SubclassA2List",
> "type": {
> "type": "array",
> "items": "SuperclassA1",
> "java-class": "java.util.List"
> }
> },
> {
> "name": "stringSuperclassA1Map",
> "type": {
> "type": "map",
> "values": "SuperclassA1"
> }
> },
> {
> "name": "integerSuperclassA1Map",
> "type": {
> "type": "array",
> "items": {
> "type": "record",
> "name": "Pair34255fab6d3d79ff",
> "namespace": "org.apache.avro.reflect",
> "fields": [
> {
> "name": "key",
> "type": "int"
> },
> {
> "name": "value",
> "type":
> "org.apache.avro.reflect.TestReflectPolymorphismData$.SuperclassA1"
> }
> ]
> },
> "java-class": "java.util.Map"
> }
> }
> ]
> }
> {code}
> related story: AVRO-1568
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