Structure of QueryResult in PQI is unclear

When a data engine returns 200 from a query operation, the body contains the result of the query. I think this should take one of two forms:

1) When the query does NOT contain an Aggregate clause, the result is an array of Atoms.
2) When the query contains an Aggregate clause, the result is a table of data (like the output from a typical SQL query).

For example, if we issued a query that included the aggregate clause:

{ …
"Aggregate": {
"Columns": [

{"ColName": "WHEN_DURATION", "Aggregator": "SUM"}

,

{"ColName": "HOW_RELIABILITY", "Aggregator": "AVG"}

],
"GroupBy": ["WHAT_ELEMENT","WHAT_SUBCLASS"]}
"Project" :

{ "Include": ["WHAT_CLUSTER", "WHAT_CLASS"] }

}

== SELECT SUM(Duration, AVG(Reliability), Cluster, Class, Groupby Element, Subclass

then the output is a table of values with four columns and could be represented in a number of ways:

{"QueryResult": {
"Table": [
[

{"ColName": "WHEN_DURATION", "Aggregator": "SUM","Value": 127.3}

,

{"ColName": "HOW_RELIABILITY","Aggregator": "AVG","Value": 83}

,

{"ColName": "WHAT_CLUSTER", "Value": 12}

,

{"ColName": "WHAT_CLASS", "Value": 23}

,

{"ColName": "WHAT_ELEMENT", "Value": 2031}

,

{"ColName": "WHAT_SUBCLASS", "Value": 1256}

],[

{"ColName": "WHEN_DURATION", "Aggregator": "SUM","Value": 993}

,

{"ColName": "HOW_RELIABILITY","Aggregator": "AVG","Value": 12}

,

{"ColName": "WHAT_CLUSTER", "Value": 12}

,

{"ColName": "WHAT_CLASS", "Value": 23}

,

{"ColName": "WHAT_ELEMENT", "Value": 2037}

,

{"ColName": "WHAT_SUBCLASS", "Value": 1334}

] ] }}

or

{"QueryResult": {
"Table": [

{"SUM(WHEN_DURATION)": 127.3, "AVG(HOW_RELIABILITY)": 83, "WHAT_CLUSTER ": 12, "WHAT_CLASS": 23 , "WHAT_ELEMENT": 2031, "WHAT_SUBCLASS": 1256}

,

{"SUM(WHEN_DURATION)": 127.3, "AVG(HOW_RELIABILITY)": 83, "WHAT_CLUSTER ": 12, "WHAT_CLASS": 23 , "WHAT_ELEMENT": 2031, "WHAT_SUBCLASS": 1256}

]}}