orientDB list of map keys

Question

I created an embedded map trough Java in the following way:

Map<String,Object> mapObjectToInsert = new HashMap<String, Object>();
    mapObjectToInsert.put("attr1",1);
    mapObjectToInsert.put("attr2","bla");

    ODocument doc = new ODocument("testClass");
    doc.field("postUrl","11");
    doc.field("jsonData",mapObjectToInsert);
    doc.save();

and now I have the following embedded map:

{
"result": [
    {
        "@type": "d",
        "@rid": "#14:0",
        "@version": 1,
        "@class": "testClass",
        "postUrl": "11",
        "postCategory": "#13:37",
        "postDateImported": "2015-04-28 15:10:38",
        "isBusniess": false,
        "isPaid": false,
        "postDateRead": "2015-04-28 15:10:33",
        "jsonData": {
            "attr1":"1"
            "attr2":"bla"            
        },
        "@fieldTypes": "postCategory=x,postDateImported=t,postDateRead=t"
    }
],
"notification": "Query executed in 0.166 sec. Returned 1 record(s)"

}

I have found that

select expand(jsonData) from testClass

Gives the following (the values of the map):

{
"result": [
    {
        "@type": "d",
        "@version": 0,
        "value": "1"
    },
    {
        "@type": "d",
        "@version": 0,
        "value": "bla"
    }
],
"notification": "Query executed in 0.159 sec. Returned 2 record(s)"

}

But I want to be able to get the keys names from jsonData (attr1 and attr2) What is the method to do so? Thank you!

Answer 1

Have you tried ?

select jsonData.keys() from testClass