The following SELECT statement converts the FeatureUsage column data in DBC.DBQLogTbl from bitmap into JSON documents containing a list of features used by the request:
select * from QryLogFeatureUseJSON sample 1;
Result:
QueryID 307180509041677178
FeatureUsageJSON {"QueryID":"307180509041677178","FeatureInfo":["DBQL STEP Logging","Partition Level Locking"]}