在满足筛选器条件的每个行中，数据库服务器将对键应用哈希函数，并探测哈希表以查找匹配的键值。
For each row that satisfies the filter condition, the database server applies hash function to the key and proves the hash table to find a match.
保存CU名称的另一个目的是为了查找行号表，从而查找该CU中所有函数的行号。
The name of the CU is also stored to find the line number table for locating the line Numbers for all the functions in this CU.
当gperf找到某种配置，并且该配置将每个keysig分配到生成的查找表中惟一位置时，将生成一个完美hash函数。
A perfect hash function is produced when gperf finds a configuration that assigns each keysig to a unique location within the generated lookup table.
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