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Re: [HACKERS] Setting pd_lower in GIN metapage - Mailing list pgsql-hackers

From Michael Paquier
Subject Re: [HACKERS] Setting pd_lower in GIN metapage
Date
Msg-id CAB7nPqShe-hnFJPCiLg836r-2yqRF5-PAoqh0QoQw74wzLObLg@mail.gmail.com
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In response to Re: [HACKERS] Setting pd_lower in GIN metapage  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: [HACKERS] Setting pd_lower in GIN metapage
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On Thu, Sep 7, 2017 at 12:59 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> The idea I'd had was to apply the masking only if pd_lower >=
> SizeOfPageHeaderData, or if you wanted to be stricter, only if
> pd_lower != 0.

If putting a check, it seems to me that the stricter one makes the
most sense. pd_lower should remain at 0 on pre-10 servers.
-- 
Michael

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