Fix bug #2483 with InnoDB, UNIQUE secondary index, and NULL values in that unique index; with the IS NULL predicate, InnoDB returned only the first matching row, though there can be many


innobase/row/row0sel.c:
  Fix bug #2483 with InnoDB, UNIQUE secondary index, and NULL values in that unique index; with the IS NULL predicate, InnoDB returned only the first matching row, though there can be many
innobase/include/data0data.h:
  Fix bug #2483 with InnoDB, UNIQUE secondary index, and NULL values in that unique index; with the IS NULL predicate, InnoDB returned only the first matching row, though there can be many
innobase/include/data0data.ic:
  Fix bug #2483 with InnoDB, UNIQUE secondary index, and NULL values in that unique index; with the IS NULL predicate, InnoDB returned only the first matching row, though there can be many