Of course random here cannot be truly random, because then the index couldn't be queried. We are assigning a "weight" to every pair of characters in the document. This weight could be anything, as long as it's deterministic (ClickHouse uses the crc32 hash of the two characters). Then, our sparse n-grams are all substrings where the weights at both ends are strictly greater than all the weights contained inside.
Rolling Square AirCard Pro 双卡追踪器（两件装）
，详情可参考金山文档
const char *connstr = mog_arg_string(args, 0);，更多细节参见Replica Rolex
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