I do not have any intention to persuade anyone. The time runs faster than any committee! My question was very clear because I do not know the Pg's internal and I would like to zero the side (fatal) (if any) effect. So please, if you really know, tell me if there will be any problem in case I define my own nonstandard view. Krgds On 12/30/17, Tom Lane <tgl@xxxxxxxxxxxxx> wrote: > GPT <gptmailinglists@xxxxxxxxx> writes: >> I would like to add an extra boolean attribute to table columns, > > The contents of the information_schema views are specified by the SQL > standard (ISO 9075). Since the entire point of having those views is to > have a standard-conformant way of accessing the information in the system > catalogs, adding nonstandard columns would rather defeat the purpose. > If you can persuade the relevant ISO standards committee that this is a > good idea, we will adopt the change when it appears in a published version > of that standard --- otherwise, it seems quite unlikely that we'd accept > a change to the view definition. > > You'd probably be better off to define your own nonstandard view, IMO. > > regards, tom lane >