In order to implement the PARAMETER_DEFAULT column in the information schema I need a way to get the expressions out of the proargdefaults column. pg_get_expr(proargdefaults, 0) gives me all expressions comma-separated, but I need them individually. I think a function like pg_get_list_nth (to keep consistent with the internal list API) could work. Alternatively, a list-to-array function might do the trick. Are there are any other potential uses cases that should be considered here? AFAICT, indexprs is the only other system catalog column that contains an expression list.
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