func (qs *QuadStore) sizeForIterator(isAll bool, dir quad.Direction, hash NodeHash) int64 {
var err error
if isAll {
return qs.Size()
}
if qs.noSizes {
if dir == quad.Predicate {
return (qs.Size() / 100) + 1
}
return (qs.Size() / 1000) + 1
}
if val, ok := qs.sizes.Get(hash.String() + string(dir.Prefix())); ok {
return val.(int64)
}
var size int64
if clog.V(4) {
clog.Infof("sql: getting size for select %s, %v", dir.String(), hash)
}
err = qs.db.QueryRow(
fmt.Sprintf("SELECT count(*) FROM quads WHERE %s_hash = $1;", dir.String()), hash.toSQL()).Scan(&size)
if err != nil {
clog.Errorf("Error getting size from SQL database: %v", err)
return 0
}
qs.sizes.Put(hash.String()+string(dir.Prefix()), size)
return size
}
