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Add hash-based indexes

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This commit is contained in:
Barak Michener 2015-08-07 14:35:24 -04:00
parent c98318aa97
commit ab3f59d21f
5 changed files with 95 additions and 44 deletions
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44
graph/sql/sql_link_iterator.go
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@ -50,11 +50,11 @@ type tagDir struct {
func (t tagDir) String() string {
if t.dir == quad.Any {
if t.justLocal {
return fmt.Sprintf("%s.__execd as %s", t.table, t.tag)
return fmt.Sprintf("%s.__execd as %s, %s.__execd_hash as %s_hash", t.table, t.tag, t.table, t.tag)
}
return fmt.Sprintf("%s.%s as %s", t.table, t.tag, t.tag)
return fmt.Sprintf("%s.%s as %s, %s.%s_hash as %s_hash", t.table, t.tag, t.tag, t.table, t.tag, t.tag)
}
return fmt.Sprintf("%s.%s as %s", t.table, t.dir, t.tag)
return fmt.Sprintf("%s.%s as %s, %s.%s_hash as %s_hash", t.table, t.dir, t.tag, t.table, t.dir, t.tag)
}
type tableDef struct {
@ -71,7 +71,7 @@ type sqlItDir struct {
type sqlIterator interface {
sqlClone() sqlIterator
buildSQL(next bool, val graph.Value) (string, []string)
buildSQL(next bool, val graph.Value, hash bool) (string, []string)
getTables() []tableDef
getTags() []tagDir
buildWhere() (string, []string)
@ -219,8 +219,8 @@ func (l *SQLLinkIterator) buildWhere() (string, []string) {
var q []string
var vals []string
for _, c := range l.constraints {
q = append(q, fmt.Sprintf("%s.%s = ?", l.tableName, c.dir))
vals = append(vals, c.vals[0])
q = append(q, fmt.Sprintf("%s.%s_hash = ?", l.tableName, c.dir))
vals = append(vals, hashOf(c.vals[0]))
}
for _, i := range l.nodeIts {
t := i.it.tableID()
@ -228,7 +228,7 @@ func (l *SQLLinkIterator) buildWhere() (string, []string) {
if t.dir == quad.Any {
dir = t.tag
}
q = append(q, fmt.Sprintf("%s.%s = %s.%s", l.tableName, i.dir, t.table, dir))
q = append(q, fmt.Sprintf("%s.%s_hash = %s.%s_hash", l.tableName, i.dir, t.table, dir))
}
for _, i := range l.nodeIts {
s, v := i.it.buildWhere()
@ -246,13 +246,17 @@ func (l *SQLLinkIterator) tableID() tagDir {
}
}
func (l *SQLLinkIterator) buildSQL(next bool, val graph.Value) (string, []string) {
func (l *SQLLinkIterator) buildSQL(next bool, val graph.Value, hash bool) (string, []string) {
query := "SELECT DISTINCT "
hashs := ""
if hash {
hashs = "_hash"
}
t := []string{
fmt.Sprintf("%s.subject", l.tableName),
fmt.Sprintf("%s.predicate", l.tableName),
fmt.Sprintf("%s.object", l.tableName),
fmt.Sprintf("%s.label", l.tableName),
fmt.Sprintf("%s.subject%s", l.tableName, hashs),
fmt.Sprintf("%s.predicate%s", l.tableName, hashs),
fmt.Sprintf("%s.object%s", l.tableName, hashs),
fmt.Sprintf("%s.label%s", l.tableName, hashs),
}
for _, v := range l.getTags() {
t = append(t, v.String())
@ -276,16 +280,16 @@ func (l *SQLLinkIterator) buildSQL(next bool, val graph.Value) (string, []string
constraint += " AND "
}
t = []string{
fmt.Sprintf("%s.subject = ?", l.tableName),
fmt.Sprintf("%s.predicate = ?", l.tableName),
fmt.Sprintf("%s.object = ?", l.tableName),
fmt.Sprintf("%s.label = ?", l.tableName),
fmt.Sprintf("%s.subject_hash = ?", l.tableName),
fmt.Sprintf("%s.predicate_hash = ?", l.tableName),
fmt.Sprintf("%s.object_hash = ?", l.tableName),
fmt.Sprintf("%s.label_hash = ?", l.tableName),
}
constraint += strings.Join(t, " AND ")
values = append(values, v.Subject)
values = append(values, v.Predicate)
values = append(values, v.Object)
values = append(values, v.Label)
values = append(values, hashOf(v.Subject))
values = append(values, hashOf(v.Predicate))
values = append(values, hashOf(v.Object))
values = append(values, hashOf(v.Label))
}
query += constraint
query += ";"