Selecting one or more specific fields in query

Hello Community,

I've been trying to figure out how to use the "select" key in the JSON query functionality of QueryStreamData...

me.QueryStreamData({
 // oldestFirst: undefined /* BOOLEAN */,
 // maxItems: undefined /* NUMBER {"defaultValue":500} */,
 // sourceTags: undefined /* TAGS */,
 // endDate: undefined /* DATETIME */,
 // query: undefined /* QUERY */,
 // source: undefined /* STRING */,
 // startDate: undefined /* DATETIME */,
 // tags: undefined /* TAGS */,
 // });

However I haven't had any luck...

There is no datashape returned for this service, and even if there was one, I'm not entirely sure I could get it to work.

I have do have a datashape for the stream of course, and I did try to use that using the following query:

"select": [
 {
 "dataShapeName": "MyDataShape",
 "fieldName": "FieldName"
 }
]

 But that didn't work either.

I also tried just querying everything from my stream and doing an infotable query:

let test = DataShapes["MyDataShape"].CreateValuesWithData({
 values: { values },
 });

 // Provide your filter using the format as described in the help topic "Query Parameter for Query Services"
 let query = {
 "select": [{
 "dataShapeName": "MyDataSHape",
 "fieldName": "FieldName",
 }],
 };

 let params = {
 t: test /* INFOTABLE */,
 query: query /* QUERY */,
 };

 result = Resources["InfoTableFunctions"].Query(params);

But this also didn't work... Anyone got any idea of what I am doing wrong?

Or that has done this with success before?

Any help would be highly appreciated!

Thanks,

Jens C.