select 1;

+----------+
| Int64(1) |
+----------+
| 1        |
+----------+

select 2 + 3;

+---------------------+
| Int64(2) + Int64(3) |
+---------------------+
| 5                   |
+---------------------+

select 4 + 0.5;

+-------------------------+
| Int64(4) + Float64(0.5) |
+-------------------------+
| 4.5                     |
+-------------------------+

select "a";

Error: 3000(PlanQuery), Schema error: No field named 'a'. Valid fields are .

select "A";

Error: 3000(PlanQuery), Schema error: No field named 'A'. Valid fields are .

select * where "a" = "A";

Error: 3000(PlanQuery), Schema error: No field named 'a'. Valid fields are .