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Re: ALTER COLUMN to change GENERATED ALWAYS AS expression?

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Ron <ronljohnsonjr@xxxxxxxxx> writes:
> On 2/7/23 09:06, Adrian Klaver wrote:
>> To force immediate reclamation of space occupied by a dropped column, you 
>> can execute one of the forms of ALTER TABLE that performs a rewrite of the 
>> whole table. This results in reconstructing each row with the dropped 
>> column replaced by a null value."

> VACUUM FULL doesn't rewrite the table?

It moves all the tuples into a new file, but it does not rebuild
individual tuples, as would be needed to delete column values.

			regards, tom lane





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