Re: [HACKERS] ALTER COLUMN/logical column position

[Andreas Pflug]

Hannu Krosing wrote:

attnum is used internally to retrieve the data 

 

Oops...

So if an additional column number is invented, it should not be a 
logical column number, but a physical storage number for internal data 
retrieval. This way, the "user interface" doesn't change, and all those 
"SELECT ... FROM pg_attribute ORDER BY attnum" continue delivering the 
expected result.

Regards,
Andreas
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