Where is MediaStore.Video.Media.DISPLAY_NAME in Android?

According to https://developer.android.com/training/data-storage/shared/media?hl=lv on android developers, where the MediaStore.Video.Media.DISPLAY_NAME appears near the begin of this article, I try to find the constant DISPLAY_NAME through a link on the MediaStore.Video.Media class (which is https://developer.android.com/reference/android/provider/MediaStore.Video.Media) and I can’t find the DISPLAY_NAME constant here. Where can I find this to see according meaning and description of this constant ?



public final class MediaStore {

    public static final class Video {
        public interface VideoColumns extends MediaColumns {

        public static final class Media implements VideoColumns {

It means that “MediaStore.Video.Media” extends MediaColumns. And MediaColumns has DISPLAY_NAME

public interface MediaColumns extends BaseColumns {
    public static final String DISPLAY_NAME = "_display_name";