Describe the bug

The response of MongoDB is inconsistent wrt to SQL databases if the schema has links of type array. When the nested table doesn't have any rows/documents in it. The response returned is different

Expected behaviour

Actual behaviour

Steps to reproduce

• Fire the query & observer the result

link table as array
if nested table has no rows, postgres and mysql returns
"details": [
                    {
                        "d3": null
                    }
                ]
but mongo returns 
"details": null,

need uniformity in our response 

Your environment

• Space Cloud version:
• OS:
• Kubernetes or Docker:
• The client api version (if applicable):
• Browser (if applicable):

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