OpenSQL() returns error when not using nutsdb

[jihoon-seo]

What happened
:
When using etcd instead of nutsdb,
the Go code line err := common.OpenSQL("../meta_db/dat/cbtumblebug.s3db") causes error.

❯ make run
./cb-tumblebug
[CLOUD-BARISTA].[ERROR]: 2021-07-14 19:46:52 etcd-driver.go:214, github.com/cloud-barista/cb-store/store-drivers/etcd-driver.InitializeDriver() - context deadline exceeded

[Update system environment]

[Setup SQL Database]
Database access info set successfully
unable to open database file: no such file or directory
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x38 pc=0x51fcbf]

goroutine 1 [running]:
database/sql.(*Stmt).ExecContext(0x0, 0x166ad68, 0xc000130010, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
/snap/go/7954/src/database/sql/sql.go:2485 +0x5f
database/sql.(*Stmt).Exec(...)
/snap/go/7954/src/database/sql/sql.go:2514
github.com/cloud-barista/cb-tumblebug/src/core/common.CreateSpecTable(0x164ba60, 0xc000134008)
/home/jhseo/go/src/github.com/cloud-barista/cb-tumblebug/src/core/common/common.go:133 +0xa5
main.main()
/home/jhseo/go/src/github.com/cloud-barista/cb-tumblebug/src/main.go:78 +0x612
Makefile:12: recipe for target 'run' failed
make: *** [run] Error 2

What you expected to happen
:

How to reproduce it (as minimally and precisely as possible)
:

Anything else we need to know?
:

Environment

• Source version or branch:
• OS:
• Others:

Proposed solution
:

Add these lines before the err := common.OpenSQL("../meta_db/dat/cbtumblebug.s3db") line:

	err := os.MkdirAll("../meta_db/dat/", os.ModePerm)
	if err != nil {
		fmt.Println(err.Error())
	}

Any other context
: