"Fly.Li" <fly...@126.com> writes:
> version: PG8.2.2
> MY Question:
> Why must "take the same number of parameters" ?

Because the GIN code will call it with a particular number of arguments.

> When I use tsearch2, I found that gin_extract_tsquery() has 3 parameters, it 
> break the rule "take the same number of parameters".

3 is the correct number of parameters for an extractQuery function
(before 8.4 anyway), so I'm not clear what you are complaining about.

                        regards, tom lane

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