Join with Condition on Money Column Fails

```
SET citus.enable_repartition_joins to ON;

CREATE TABLE dist1(a INT, b money);
SELECT create_distributed_table('dist1', 'a');

CREATE TABLE dist2(a INT, b money);
SELECT create_distributed_table('dist2', 'a');

SELECT * FROM dist1, dist2 WHERE (dist1.b = dist2.b);

ERROR: cache lookup failed for opclass 0
CONTEXT: while executing command on localhost:9701
```
This query does not fail when the `b` columns are of type `INT`.