Amit Langote <> writes:
> On 2017/09/12 23:27, Amit Kapila wrote:
>> I think one point which might be missed is that the patch needs to
>> modify pd_lower for all usages of metapage, not only when it is first
>> time initialized.

> Maybe I'm missing something, but isn't the metadata size fixed and hence
> pd_lower won't change once it's initialized?  Maybe, it's not true for all
> index types?

No, the point is that you might be dealing with an index recently
pg_upgraded from v10 or before, which does not have the correct
value for pd_lower on that page.  This has to be coped with.

                        regards, tom lane

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