任务的复杂性取决于所计数列的数量，而不是测试的原始数据。
The complexity of the job is determined by the number of counted columns and not by the raw number of tests.
Vector使用两个原始数据类型：string(元素数据)和Integer(元素计数)。
Vector USES two primitive data types — string (element data) and Integer (element count).
提供命令行工具，从原始的日志文件中生成汇总的统计数据和性能图表。
A command line tool for generating aggregated statistics and performance graphs from raw log files.
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