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why declare arg as a array in FunctionCallInfoData structure - Mailing list pgsql-hackers

From Tao Ma
Subject why declare arg as a array in FunctionCallInfoData structure
Date
Msg-id gm66jg$2jf4$1@news.hub.org
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Responses Re: why declare arg as a array in FunctionCallInfoData structure  (Martijn van Oosterhout <kleptog@svana.org>)
Re: why declare arg as a array in FunctionCallInfoData structure  (Pavel Stehule <pavel.stehule@gmail.com>)
Re: why declare arg as a array in FunctionCallInfoData structure  (Tom Lane <tgl@sss.pgh.pa.us>)
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hi,

When I read the postgresql codes, I noticed that the FunctionCallInfoData 
structure(declared in the src/include/fmgr.h) contains two arrays 'arg' and 
'argnull'.
Why don't you declare it as a pointer and allocate the memory from heap? It 
saves more momery if 'arg' and 'argnull' declares as pointer type.

Can anyone explain it to me?

Thanks in advance.

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