func (c *compaction) newIterator() iterator.Iterator {
s := c.s
icmp := s.cmp
level := c.level
icap := 2
if c.level == 0 {
icap = len(c.tables[0]) + 1
}
its := make([]iterator.Iterator, 0, icap)
ro := &opt.ReadOptions{
DontFillCache: true,
}
strict := s.o.GetStrict(opt.StrictIterator)
for i, tt := range c.tables {
if len(tt) == 0 {
continue
}
if level+i == 0 {
for _, t := range tt {
its = append(its, s.tops.newIterator(t, nil, ro))
}
} else {
it := iterator.NewIndexedIterator(tt.newIndexIterator(s.tops, icmp, nil, ro), strict, true)
its = append(its, it)
}
}
return iterator.NewMergedIterator(its, icmp, true)
}
func (db *DB) newRawIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator {
s := db.s
em, fm := db.getMems()
v := s.version()
ti := v.getIterators(slice, ro)
n := len(ti) + 2
i := make([]iterator.Iterator, 0, n)
i = append(i, em.NewIterator(slice))
if fm != nil {
i = append(i, fm.NewIterator(slice))
}
i = append(i, ti...)
mi := iterator.NewMergedIterator(i, s.cmp, true)
mi.SetReleaser(&versionReleaser{v: v})
return mi
}