Subqueries Q D F

Slice:	video_fresh
Index:	95
Name:	SubqueriesQDF
Group:
Description:	Aggregated sum of subqueries' QDF (quick doc fraction)
Tags:	TG_DYNAMIC TG_QUERY_ONLY TG_USER TG_USER_SEARCH TG_FRESHNESS_USE
Authors:	vilenkin
Responsibles:	vilenkin juver