what is the hash function ' s main idea in tsearch2?

From: 沈一枫 <alphahunters(at)163(dot)com>
To: "pgsql-hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: what is the hash function ' s main idea in tsearch2?
Date: 2005-10-20 14:55:39
Message-ID: 4357AFEB.000006.19401@bj163app31.163.com
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Teodor Sigaev :
thanks for your help.
And now i' m wondering such a question : how is the signatures in the tsearch2 signature tree are made,because the hash function crc32_sz() is too complex for me to read.what's the hash func 's basic idea ?There are so many tsvectors in the db abd crc32_sz() used what feathers done such a difficult job,will you give a short descripton?

thanks

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