kotlinコードの場合:
前
@ColumnInfo(name = "question_id")
var questionId: Long
後
@ColumnInfo(name = "question_id", index = true) //just add index = true
var questionId: Long
kotlinコードの場合:
前
@ColumnInfo(name = "question_id")
var questionId: Long
後
@ColumnInfo(name = "question_id", index = true) //just add index = true
var questionId: Long