// if the upstream is an interval operator, the interval info is also kept here to get the time window to check if current data block needs to be loaded.
// if the upstream is an interval operator, the interval info is also kept here to get the time window to check if
// current data block needs to be loaded.
SIntervalinterval;
SAggSupporter*pAggSup;
SExprSupp*pExprSup;// expr supporter of aggregate operator
SAggSupporter*pAggSup;
SExprSupp*pExprSup;// expr supporter of aggregate operator