Equivalence check for DISTINCT UNION ALL of disjoint sets yields invalid Coq code #75
Description
The following query:
schema base(id:int, join_id:int);
schema rel1(id:int, other_value:int);
schema rel2(id:int, other_value:int);
table aa(base);
table bb(rel1);
table cc(rel2);
query q1
`SELECT DISTINCT id AS id,
from_b AS from_b,
from_c AS from_c
FROM (SELECT DISTINCT a.id AS id,
1 AS from_b,
0 AS from_c,
b.other_value AS other_value
FROM aa a
JOIN bb b
ON a.join_id = b.id
UNION ALL
SELECT DISTINCT a.id AS id,
0 AS from_b,
1 AS from_c,
c.other_value AS other_value
FROM aa a
JOIN cc c
ON a.join_id = c.id) _`;
query q2
`SELECT DISTINCT a.id AS id,
1 AS from_b,
0 AS from_c,
b.other_value AS other_value
FROM aa a
JOIN bb b
ON a.join_id = b.id
UNION ALL
SELECT DISTINCT a.id AS id,
0 AS from_b,
1 AS from_c,
c.other_value AS other_value
FROM aa a
JOIN cc c
ON a.join_id = c.id`;
verify q1 q2;
yields the error:
Invalid generated Coq code. Please file an issue.
{"size":[1],"status":"UNSAT"}
generated/nbdZQWtaTnVSi.rkt:19:25: id: unbound identifier in module
in: id
context...:
/root/.racket/6.8/pkgs/rosette/rosette/base/form/module.rkt:16:0
standard-module-name-resolver
/Cosette-Web/backend/Cosette/rosette/server.rkt:38:10
AFAICT these two queries should be equivalent, since the two subqueries UNION ALLd are disjoint and each is DISTINCTed.