private long getPxValue(int endValIndex, int maxValIndex, long maxValue) {
        if (endValIndex < maxValIndex) {
            return (long) Math.pow(2, endValIndex + 1);
        } else {
            return (maxValue == Long.MIN_VALUE) ? 0 : maxValue;
        }
    }
Initial Exponential Statistics for Time Histogram

@param metricName   metric name
@param prefix       the prefix of metric item
inlong-tubemq/tubemq-core/src/main/java/org/apache/inlong/tubemq/corebase/metric/impl/ESTHistogram.java