Hello everybody,
I have an issue with Ciao’s tabling: When I try to call abolish_all_tables, I get an error.
Here is an example:
I have a prolog file ‘foo.pl’ with the following contents:
================= BEGIN =================
:- use_package(library(tabling)).
:- data edge/2.
:- table tc/2.
edge(a, b).
edge(b, c).
%Left-recursive transitive closure.
tc(X, Y) :- edge(X, Y).
tc(X, Y) :- tc(X, Z), edge(Z, Y).
================= END =================
I load this file in the ciao repl and have the following interactions:
================= BEGIN =================
?- ensure_loaded(foo).
yes
?- tc(a, b).
yes
?- tc(a, c).
yes
?- tc(c, a).
no
?- asserta_fact(edge(c,a)).
yes
?- tc(c, a).
no
?- abolish_all_tables.
{ERROR: user:abolish_all_tables/0 - existence error: procedure:user:abolish_all_tables/0 does not exist}
no
================= END =================
My problem is that the truth of `tc(c,a)` changes due to me asserting the fact `edge(c,a)`.
Since I already evaluated `tc(c,a)` once, and tc is declared as tabled, ciao gives me the tabled, now incorrect, value instead of performing a new computation.
I would therefore like to abolish all tables to force ciao to evaluate the query anew.
What is it that I am doing wrong?
Thank you for your help!
Lorenz
PS: I am using the current development version of ciao (1.15-1781-g328b907). During the configuration stage of the build I explicitly enabled tabling support.
