Panic on SELECT ... WHERE ... OR

Reproduction script:

```
CREATE TABLE test (pk1 int primary key, i int);
select * from test where pk1 = 1 or i = 1;
```

The only requirement seems to be that the first filter matches an index and the second one doesn't.

Swapping the order of the filters (`select * from test where i = 1 or pk1 = 1;`) does NOT panic.