Database: academic
Question: return me the number of the keywords related to " H. V. Jagadish " .
SQL: select count ( distinct t1.keyword ) from publication_keyword as t5 join keyword as t1 on t5.kid  =  t1.kid join publication as t3 on t3.pid  =  t5.pid join writes as t4 on t4.pid  =  t3.pid join author as t2 on t4.aid  =  t2.aid where t2.name  =  "h. v. jagadish";