@Override
    public String format() {
        return "INNER JOIN";
    }
Constructor

@param inputs The inputs is a list of input node id
@param outputs The outputs is a list of output node id
@param joinConditionMap The joinConditionMap is a map of join conditions
        the key of joinConditionMap is the node id of join node
        the value of joinConditionMap is a list of join contidition
@param systemTime The system time for temporal join
inlong-sort/sort-common/src/main/java/org/apache/inlong/sort/protocol/transformation/relation/InnerTemporalJoinRelation.java