func minimalIndexes(sargables map[datastore.Index]*indexEntry, pred expression.Expression) (
map[datastore.Index]*indexEntry, error) {
for s, se := range sargables {
for t, te := range sargables {
if t == s {
continue
}
if narrowerOrEquivalent(se, te) {
delete(sargables, t)
}
}
}
minimals := make(map[datastore.Index]*indexEntry, len(sargables))
for s, se := range sargables {
spans, err := SargFor(pred, se.sargKeys, len(se.keys))
if err != nil || len(spans) == 0 {
logging.Errorp("Sargable index not sarged", logging.Pair{"pred", pred},
logging.Pair{"sarg_keys", se.sargKeys}, logging.Pair{"error", err})
return nil, errors.NewPlanError(nil, fmt.Sprintf("Sargable index not sarged; pred=%v, sarg_keys=%v, error=%v",
pred.String(), se.sargKeys.String(), err))
return nil, err
}
se.spans = spans
minimals[s] = se
}
return minimals, nil
}
func (this *Server) getPrepared(request Request, namespace string) (*plan.Prepared, errors.Error) {
prepared := request.Prepared()
if prepared == nil {
parse := time.Now()
stmt, err := n1ql.ParseStatement(request.Statement())
if err != nil {
return nil, errors.NewParseSyntaxError(err, "")
}
prep := time.Now()
prepared, err = planner.BuildPrepared(stmt, this.datastore, this.systemstore, namespace, false)
if err != nil {
return nil, errors.NewPlanError(err, "")
}
if logging.LogLevel() >= logging.TRACE {
request.Output().AddPhaseTime("plan", time.Since(prep))
request.Output().AddPhaseTime("parse", prep.Sub(parse))
}
}
if logging.LogLevel() >= logging.DEBUG {
// log EXPLAIN for the request
logExplain(prepared)
}
return prepared, nil
}
func (this *Server) getPrepared(request Request, namespace string) (*plan.Prepared, errors.Error) {
prepared := request.Prepared()
if prepared == nil {
parse := time.Now()
stmt, err := n1ql.ParseStatement(request.Statement())
if err != nil {
return nil, errors.NewParseSyntaxError(err, "")
}
prep := time.Now()
prepared, err = planner.BuildPrepared(stmt, this.datastore, this.systemstore, namespace, false)
if err != nil {
return nil, errors.NewPlanError(err, "")
}
// In order to allow monitoring to track prepared statement executed through
// N1QL "EXECUTE", set request.prepared - because, as of yet, it isn't!
//
// HACK ALERT - request does not currently track the request type
// and even if it did, and prepared.(*plan.Prepared) is set, it
// does not carry a name or text.
// This should probably done in build.go and / or build_execute.go,
// but for now this will do.
exec, ok := stmt.(*algebra.Execute)
if ok && exec.Prepared() != nil {
prep, _ := plan.TrackPrepared(exec.Prepared())
request.SetPrepared(prep)
}
if logging.LogLevel() >= logging.TRACE {
request.Output().AddPhaseTime("plan", time.Since(prep))
request.Output().AddPhaseTime("parse", prep.Sub(parse))
}
}
if logging.LogLevel() >= logging.DEBUG {
// log EXPLAIN for the request
logExplain(prepared)
}
return prepared, nil
}
