Obtaining segments for delta ingestion

I tried querying to get the segments, but the results look nothing like the segments part of the spec from the logs when segments are blank.
Query:

{

“queryType”:“segmentMetadata”,

“dataSource”:“publisher.deal.impression.summary.partial”,

“intervals”:[“2017-06-28/2017-06-29”],

“toInclude”:{“type”: “list”, “columns”: [“interval”]}

}

``