Abort is triggered in debug build due to logical error.

```
CREATE TABLE A(k UInt32, t UInt32, a UInt64) ENGINE = MergeTree() ORDER BY (k, t);
INSERT INTO A(k,t,a) VALUES (1,101,1),(1,102,2),(1,103,3),(1,104,4),(1,105,5);

CREATE TABLE B(k UInt32, t UInt32, b UInt64) ENGINE = MergeTree() ORDER BY (k, t);
INSERT INTO B(k,t,b) VALUES (1,102,2), (1,104,4);

SELECT 
    (257, NULL, NULL), 
    (1, -2), 
    (-2, 7), 
    ('102.5', '0.03', NULL, NULL, NULL), 
    A.k, 
    toString((10, 0), 10.000100135803223), 
    A.a, 
    B.b, 
    toString(B.t), 
    B.k
FROM A
ASOF INNER JOIN B ON (A.k = B.k) AND NULL AND greaterOrEquals(B.t)
ORDER BY tuple(A.k) ASC;


Received exception from server (version 20.7.1):
Code: 1001. DB::Exception: Received from localhost:9000. DB::Exception: St12out_of_range: vector. 
```

throw Exception("Column '" + name + "' is ambiguous", ErrorCodes::AMBIGUOUS_COLUMN_NAME);
            }
            if (in_left_table)
                membership = 1;
            if (in_right_table)
                membership = 2;
        }
        if (membership && table_number == 0)
        {
            table_number = membership;
            std::swap(ident, identifiers[0]); 
        }
        if (membership && membership != table_number)
        {
            throw Exception("Invalid columns in JOIN ON section. Columns "
                        + identifiers[0]->getAliasOrColumnName() + " and " + ident->getAliasOrColumnName()
                        + " are from different tables.", ErrorCodes::INVALID_JOIN_ON_EXPRESSION);
        }
    }
    return table_number;
}
[[noreturn]] void CollectJoinOnKeysMatcher::throwSyntaxException(const String & msg)
{
    throw Exception("Invalid expression for JOIN ON. " + msg +
        " Supported syntax: JOIN ON Expr([table.]column, ...) = Expr([table.]column, ...) "
        "[AND Expr([table.]column, ...) = Expr([table.]column, ...) ...]",
        ErrorCodes::INVALID_JOIN_ON_EXPRESSION);
}
}