Tried to do partition exchange and it failed because of 2 extra SYS_* columns in the table:
select NAME from SYS.COL$ WHERE obj# =41900658 and name like 'SYS_%'; SYS_C00054_14031410:34:03$ SYS_C00055_14031410:34:03$
ALL_TAB_COLUMNS show nothing on these
What are these? and why CTAS didn't pick them up?
extended stats - how do i drop them?