func (p *stConstructor_MergedMemDB) newIterator() iter.Iterator {
var its []iter.Iterator
for _, m := range p.mem {
its = append(its, m.NewIterator())
}
return iter.NewMergedIterator(its, comparer.BytesComparer{})
}
func (c *compaction) newIterator() iter.Iterator {
s := c.s
icmp := s.cmp
level := c.level
icap := 2
if c.level == 0 {
icap = len(c.tables[0]) + 1
}
its := make([]iter.Iterator, 0, icap)
ro := &opt.ReadOptions{}
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, ro))
}
} else {
it := iter.NewIndexedIterator(tt.newIndexIterator(s.tops, icmp, ro))
its = append(its, it)
}
}
return iter.NewMergedIterator(its, icmp)
}
// newRawIterator return merged interators of current version, current frozen memdb
// and current memdb.
func (d *DB) newRawIterator(ro *opt.ReadOptions) iter.Iterator {
s := d.s
mem := d.getMem()
v := s.version()
ti := v.getIterators(ro)
ii := make([]iter.Iterator, 0, len(ti)+2)
ii = append(ii, mem.cur.NewIterator())
if mem.froze != nil {
ii = append(ii, mem.froze.NewIterator())
}
ii = append(ii, ti...)
return iter.NewMergedIterator(ii, s.cmp)
}