Database: academic
Question: return me the authors who have the most number of papers in PVLDB .
SQL:
SELECT t1.name FROM publication AS t4 JOIN journal AS t2 ON t4.jid  =  t2.jid JOIN writes AS t3 ON t3.pid  =  t4.pid JOIN author AS t1 ON t3.aid  =  t1.aid WHERE t2.name  =  "PVLDB" GROUP BY t1.name ORDER BY COUNT ( DISTINCT t4.title ) DESC LIMIT 1;