WL#3047: Fulltext: "index merge" join method on fulltext indexes

Affects: Server-Prototype Only   —   Status: Un-Assigned   —   Priority: Medium

Make OR'ed full-text queries use full-text index:
SELECT * FROM t1 WHERE MATCH(a) AGAINST('AAAA' IN BOOLEAN MODE) OR
                       MATCH(a) AGAINST('BBBB' IN BOOLEAN MODE);