exec-ddl
CREATE TABLE a (k INT PRIMARY KEY, i INT, s STRING, d DECIMAL NOT NULL)
----
TABLE a
 ├── k int not null
 ├── i int
 ├── s string
 ├── d decimal not null
 └── INDEX primary
      └── k int not null

opt
SELECT k, s FROM a WHERE s >= 'foo'
----
select
 ├── columns: k:1(int!null) s:3(string!null)
 ├── stats: [rows=333.333333]
 ├── cost: 1070
 ├── key: (1)
 ├── fd: (1)-->(3)
 ├── scan a
 │    ├── columns: k:1(int!null) s:3(string)
 │    ├── stats: [rows=1000]
 │    ├── cost: 1060
 │    ├── key: (1)
 │    └── fd: (1)-->(3)
 └── filters [type=bool, outer=(3), constraints=(/3: [/'foo' - ]; tight)]
      └── s >= 'foo' [type=bool, outer=(3), constraints=(/3: [/'foo' - ]; tight)]
