Add drntest case for mismatched value type request
Add drntest case for unknown column error of add command
Change example of invalid value type
Validate column values
Fix testcase for invalid time
Don't specify key for array table
Add record to array table correctly
Don't add new record if there is any error
Don't delete record if it is correctly added
Return UnknownColumn error correctly
Raise error for missing column correctly
Put drntest cases for errors under error/