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https://issues.apache.org/jira/browse/ATLAS-2933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sarath Subramanian resolved ATLAS-2933.
---------------------------------------
Resolution: Fixed
> Empty array attributes are returned as null instead of an empty list
> --------------------------------------------------------------------
>
> Key: ATLAS-2933
> URL: https://issues.apache.org/jira/browse/ATLAS-2933
> Project: Atlas
> Issue Type: Bug
> Affects Versions: 1.1.0
> Reporter: Cade Parker
> Assignee: Le Ma
> Priority: Major
> Attachments: ATLAS-2933.patch
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
>
> Given the following entity def:
> {code:java}
> {
> "entityDefs": [
> {
> "name": "ExampleType",
> "superTypes": [],
> "typeVersion": "0.1",
> "attributeDefs": [
> {
> "name": "things",
> "typeName": "array<string>",
> "cardinality": "SINGLE",
> "isIndexable": false,
> "isOptional": false,
> "isUnique": false
> }
> ]
> }
> ]
> }
> {code}
> I can POST a new entity with an empty array for the things attribute
> successfully:
> {code:java}
> POST /api/atlas/v2/entity
> {
> "entity":{
> "typeName":"ExampleType",
> "attributes":{
> "things": []
> },
> "guid":"-thing",
> "version":1
> }
> }
> {code}
> But when i GET the entity by guid, the attribute is null instead of the empty
> list:
> {code:java}
> GET /api/atlas/v2/entity/guid/d5e33187-3293-4206-bcb8-807dc87c1440
> {
> "referredEntities": {},
> "entity": {
> "typeName": "ExampleType",
> "attributes": {
> "things": null
> },
> "guid": "d5e33187-3293-4206-bcb8-807dc87c1440",
> "status": "ACTIVE",
> "createdBy": "admin",
> "updatedBy": "admin",
> "createTime": 1540335741854,
> "updateTime": 1540335741854,
> "version": 1
> }
> }
> {code}
> Atlas should preserve the original value of the create request as an empty
> list. Returning null here causes further confusion, because the attribute is
> defined with `isOptional: false` so any consumer of the entity would
> reasonably expect a non-null value.
> I tested this behavior against Atlas versions 1.0.0 and 1.1.0
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