core/src/main/java/site/ycsb/workloads/TimeSeriesWorkload.java [742:774]:
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    final long startTimestamp;
    if (offsets > 0) {
      startTimestamp = state.startTimestamp + state.timestampGenerator.getOffset(offsets);
    } else {
      startTimestamp = state.startTimestamp;
    }
    
    // rando tags
    Set<String> fields = new HashSet<String>();
    for (int i = 0; i < tagPairs; ++i) {
      if (groupBy && groupBys[i]) {
        fields.add(tagKeys[i]);
      } else {
        fields.add(tagKeys[i] + tagPairDelimiter + 
            tagValues[random.nextInt(tagCardinality[i])]);
      }
    }
    
    if (queryTimeSpan > 0) {
      final long endTimestamp;
      if (queryRandomTimeSpan) {
        endTimestamp = startTimestamp + (timestampInterval * random.nextInt(queryTimeSpan / timestampInterval));
      } else {
        endTimestamp = startTimestamp + queryTimeSpan;
      }
      fields.add(timestampKey + tagPairDelimiter + startTimestamp + queryTimeSpanDelimiter + endTimestamp);
    } else {
      fields.add(timestampKey + tagPairDelimiter + startTimestamp);  
    }
    if (groupBy) {
      fields.add(groupByKey + tagPairDelimiter + groupByFunction);
    }
    if (downsample) {
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core/src/main/java/site/ycsb/workloads/TimeSeriesWorkload.java [808:840]:
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    final long startTimestamp;
    if (offsets > 0) {
      startTimestamp = state.startTimestamp + state.timestampGenerator.getOffset(offsets);
    } else {
      startTimestamp = state.startTimestamp;
    }
    
    // rando tags
    Set<String> fields = new HashSet<String>();
    for (int i = 0; i < tagPairs; ++i) {
      if (groupBy && groupBys[i]) {
        fields.add(tagKeys[i]);
      } else {
        fields.add(tagKeys[i] + tagPairDelimiter + 
            tagValues[random.nextInt(tagCardinality[i])]);
      }
    }
    
    if (queryTimeSpan > 0) {
      final long endTimestamp;
      if (queryRandomTimeSpan) {
        endTimestamp = startTimestamp + (timestampInterval * random.nextInt(queryTimeSpan / timestampInterval));
      } else {
        endTimestamp = startTimestamp + queryTimeSpan;
      }
      fields.add(timestampKey + tagPairDelimiter + startTimestamp + queryTimeSpanDelimiter + endTimestamp);
    } else {
      fields.add(timestampKey + tagPairDelimiter + startTimestamp);  
    }
    if (groupBy) {
      fields.add(groupByKey + tagPairDelimiter + groupByFunction);
    }
    if (downsample) {
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