Ejemplo n.º 1
0
func (e *Engine) CreateIterator(opt influxql.IteratorOptions) (influxql.Iterator, error) {
	if call, ok := opt.Expr.(*influxql.Call); ok {
		refOpt := opt
		refOpt.Expr = call.Args[0].(*influxql.VarRef)

		aggregate := true
		if opt.Interval.IsZero() {
			switch call.Name {
			case "first":
				aggregate = false
				refOpt.Limit = 1
				refOpt.Ascending = true
			case "last":
				aggregate = false
				refOpt.Limit = 1
				refOpt.Ascending = false
			}
		}

		inputs, err := e.createVarRefIterator(refOpt, aggregate)
		if err != nil {
			return nil, err
		} else if len(inputs) == 0 {
			return nil, nil
		}

		// Wrap each series in a call iterator.
		for i, input := range inputs {
			if opt.InterruptCh != nil {
				input = influxql.NewInterruptIterator(input, opt.InterruptCh)
			}

			itr, err := influxql.NewCallIterator(input, opt)
			if err != nil {
				return nil, err
			}
			inputs[i] = itr
		}

		return influxql.NewParallelMergeIterator(inputs, opt, runtime.GOMAXPROCS(0)), nil
	}

	itrs, err := e.createVarRefIterator(opt, false)
	if err != nil {
		return nil, err
	}

	itr := influxql.NewSortedMergeIterator(itrs, opt)
	if itr != nil && opt.InterruptCh != nil {
		itr = influxql.NewInterruptIterator(itr, opt.InterruptCh)
	}
	return itr, nil
}
Ejemplo n.º 2
0
func (e *Engine) CreateIterator(opt influxql.IteratorOptions) (influxql.Iterator, error) {
	if call, ok := opt.Expr.(*influxql.Call); ok {
		refOpt := opt
		refOpt.Expr = call.Args[0].(*influxql.VarRef)
		inputs, err := e.createVarRefIterator(refOpt)
		if err != nil {
			return nil, err
		} else if len(inputs) == 0 {
			return nil, nil
		}

		// Wrap each series in a call iterator.
		for i, input := range inputs {
			if opt.InterruptCh != nil {
				input = influxql.NewInterruptIterator(input, opt.InterruptCh)
			}

			itr, err := influxql.NewCallIterator(input, opt)
			if err != nil {
				return nil, err
			}
			inputs[i] = itr
		}

		return influxql.NewParallelMergeIterator(inputs, opt, runtime.GOMAXPROCS(0)), nil
	}

	itrs, err := e.createVarRefIterator(opt)
	if err != nil {
		return nil, err
	}

	itr := influxql.NewSortedMergeIterator(itrs, opt)
	if itr != nil && opt.InterruptCh != nil {
		itr = influxql.NewInterruptIterator(itr, opt.InterruptCh)
	}
	return itr, nil
}