여러 플랫 파일을 와일드카드 유니온한 후 시간 전용 필드를 문자열 유형으로 변환하면 다음 오류가 발생할 수 있습니다.
"The field '[xxx]' in the datasource 'relation' does not exist in your database. It was either modified or removed"('relation'(관계) 데이터 원본의 '[xxx]' 필드가 데이터베이스에 없습니다. 수정 또는 제거되었습니다.)
예를 들면 다음과 같습니다.
001474500

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