I have Ubuntu 18.04. I have Tarantool 2.3, pulled from source today.

I execute these requests:

tarantool> box.execute([[CREATE TABLE t (a INTEGER PRIMARY KEY, a INTEGER);]])

• null
• Space field 'A' is duplicate
  ...

tarantool> box.execute([[CREATE VIEW v AS SELECT 1 AS a, 1 AS a;]])

• row_count: 1
  ...

This is not consistent. In the first case, the duplicate column
name causes an error. In the second case, the duplicate column
name does not cause an error. Instead, Tarantool "fixes"
the problem and creates a column named A_1.