Apache Druid sql query conversion to json based query - druid

Question

I am trying to convert the following druid sql query to a druid json query, as one of the columns i have is a multi-value dimension for which druid does not support a sql style query.
My sql query:
SELECT date_dt, source, type_labels, COUNT(DISTINCT unique_p_hll)
FROM "test"
WHERE
type_labels = 'z' AND
(a_id IN ('a', 'b', 'c') OR b_id IN ('m', 'n', 'p'))
GROUP BY date_dt, source, type_labels;
unique_p_hll is an hll column with uniques.
The druid json query i came up with is following:
{
"queryType": "groupBy",
"dataSource": "test",
"granularity": "day",
"dimensions": ["source", "type_labels"],
"limitSpec": {},
"filter": {
"type": "and",
"fields": [
{ "type": "selector", "dimension": "type_labels", "value": "z" },
{ "type": "or", "fields": [
{ "type": "in", "dimension": "a_id", "values": ["a", "b", "c"] },
{ "type": "in", "dimension": "b_id", "values": ["m", "n", "p"] }
]}
]
},
"aggregations": [
{ "type": "longSum", "name": "unique_p_hll", "fieldName": "p_id" }
],
"intervals": [ "2018-08-01/2018-08-02" ]
}
But the json query seems to be returning empty resultset.
I can see the output correctly in Pivot UI. Though the array column type_labels values show up as {"array_element": "z"} instead of simply "z".

Answer 1

Does the query return empty string, or does it return a formatted JSON with zero records?
If the former, I can suggest a couple of leads for debugging this issue:
Make sure that the query is properly sent to the Broker, as shown in Druid's query tutorial:
curl -X 'POST' -H 'Content-Type:application/json' -d #query-file.json http://<BROKER-IP>:<BROKER-PORT>/druid/v2?pretty
Also, check the Broker's log for errors.