Method getScanStartTimeSeconds

src/core/TsdbQuery.java:1575–1614

Returns the UNIX timestamp from which we must start scanning.

()

  
  /** Returns the UNIX timestamp from which we must start scanning.  */
  long getScanStartTimeSeconds() {
    // Begin with the raw query start time.
    long start = getStartTime();

    // Convert to seconds if we have a query in ms.
    if ((start & Const.SECOND_MASK) != 0L) {
      start /= 1000L;
    }
    
    // if we have a rollup query, we have different row key start times so find
    // the base time from which we need to search
    if (rollup_query != null) {
      long base_time = RollupUtils.getRollupBasetime(start, 
          rollup_query.getRollupInterval());
      if (rate) {
        // scan one row back so we can get the first rate value.
        base_time = RollupUtils.getRollupBasetime(base_time - 1, 
            rollup_query.getRollupInterval());
      }
      return base_time;
    }

    // First, we align the start timestamp to its representative value for the
    // interval in which it appears, if downsampling.
    long interval_aligned_ts = start;
    if (downsampler != null && downsampler.getInterval() > 0) {
      // Downsampling enabled.
      // TODO - calendar interval
      final long interval_offset = (1000L * start) % downsampler.getInterval();
      interval_aligned_ts -= interval_offset / 1000L;
    }

    // Then snap that timestamp back to its representative value for the
    // timespan in which it appears.
    final long timespan_offset = interval_aligned_ts % Const.MAX_TIMESPAN;
    final long timespan_aligned_ts = interval_aligned_ts - timespan_offset;

    // Don't return negative numbers.
    return timespan_aligned_ts > 0L ? timespan_aligned_ts : 0L;
  }

  /** Returns the UNIX timestamp at which we must stop scanning.  */
  long getScanEndTimeSeconds() {