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=330, distinct(1)=330, null(1)=0, distinct(3)=98.265847, null(3)=0]
 ├── cost: 1070.03
 ├── key: (1)
 ├── fd: (1)-->(3)
 ├── scan a
 │    ├── columns: k:1(int!null) s:3(string)
 │    ├── stats: [rows=1000, distinct(1)=1000, null(1)=0, distinct(3)=100, null(3)=10]
 │    ├── cost: 1060.02
 │    ├── key: (1)
 │    └── fd: (1)-->(3)
 └── filters
      └── s >= 'foo' [type=bool, outer=(3), constraints=(/3: [/'foo' - ]; tight)]
