Tanmay Deshpande <tp(dot)deshpande07(at)gmail(dot)com> writes:
> while adding a column to an existing system catalog I am getting following
> error while initdb
> FATAL: incorrect number of columns in row (expected 22, got 21)
> where do I have to make the changes ?
I'd say you missed updating relnatts in the hard-coded row for
pg_attribute in pg_class.h.
The more general answer is to look through our git history for a previous
commit that did something like what you want, and then read through it to
see if you missed anything.
regards, tom lane