Given the following document in MongoDB matrix_variable collection:
{
"_id" : ObjectId("5b2367c9c9e77c0007ca0111"),
"createdOn" : ISODate("2018-06-15T07:16:25.459Z"),
"modifiedOn" : ISODate("2018-07-02T02:04:16.661Z"),
"variableId" : "183cf101d2334ac09bd0db9aee96081f",
"name" : "lfzq_test",
"description" : "",
"lastModifiedUserEmail" : "admin1@abc.com",
"headerRow" :

{ "rowId" : "0b002942a5b4424f98fcc270af0290c3", "values" : [ "name", "value" ], "isEncrypted" : [ false, true ] }

,
"rows" : [

{ "rowId" : "940467f9bb724d1688086baeec05049b", "values" : [ "lfzq123q", "751c634ca5e24102a00800b386955a5c" ] }

],
"deleted" : false
}
The "headerRow" property is exposed as separate entity type in OData schema, but not "rows" property.

I found the following entity types with odata/$metadata:
<EntityType Name="headerRow">...</EntityType>
<EntityType Name="matrix_variable">...</EntityType>

Github repo to showcase the issue:
https://github.com/limcheekin/teiid-spring-boot-mongodb-odata

Related StackOverflow post:
https://stackoverflow.com/a/59385181/303211