get_column_default()
returns a formula or value or NULL.
Arguments
- value
Value used as default value.
- formula
Formula used as default value.
- allow_null
If
TRUE
, returnNULL
if bothvalue
andformula
areNULL
.- call
The execution environment of a currently running function, e.g.
caller_env()
. The function will be mentioned in error messages as the source of the error. See thecall
argument ofabort()
for more information.