No error for an ambiguous SELECT #12337
Description
Reproducer:
tarantool> box.execute([[SELECT a FROM (SELECT 1 AS a, 2 AS a);]])
---
- metadata:
- name: a
type: integer
rows:
- [1]
...
tarantool> box.execute([[SELECT * FROM (SELECT 1 AS a, 2 AS a);]])
---
- metadata:
- name: a
type: integer
- name: a
type: integer
rows:
- [1, 1]
...In both cases, it is impossible to determine which value for a should be returned.