Remove ^@ From Output

[juliojimenez]

Describe the bug
Remove ^@ From Output

To Reproduce
Steps to reproduce the behavior:

(ch:query *db* "CREATE TABLE string_demo 
                (
                    city String,
                    state FixedString(2)
                )
                ENGINE = MergeTree
                ORDER BY tuple()" :console t)

(ch:query *db* "INSERT INTO string_demo VALUES
                    ('Albany', 'NY'),
                    ('Salem', 'OR'),
                    ('Just testing', 'X')" :console t)

(ch:query *db* "SELECT *
                FROM string_demo FORMAT Pretty" :console t)

(ch:query *db* "SELECT *
                FROM string_demo FORMAT CSV")

Output:

┌──────────────┬───────┐
│ city         │ state │
├──────────────┼───────┤
│ Albany       │ NY    │
├──────────────┼───────┤
│ Salem        │ OR    │
├──────────────┼───────┤
│ Just testing │ X\0     │
└──────────────┴───────┘

(("\"X\0\"")
 ("\"OR\"
\"Just testing\"")
 ("\"NY\"
\"Salem\"")
 ("\"Albany\""))