Function NewNestedContextReadWriter

datasource/context.go:223–228

NewNestedContextReader provides a context reader which is a composite of ordered child readers the first reader with a key will be used

(readers []expr.ContextReader, writer expr.ContextWriter, ts time.Time)

// NewNestedContextReader provides a context reader which is a composite of ordered child readers
// the first reader with a key will be used
func NewNestedContextReadWriter(readers []expr.ContextReader, writer expr.ContextWriter, ts time.Time) expr.ContextReadWriter {
	if rw, ok := writer.(expr.ContextReader); ok {
		readers = append(readers, rw)
	}
	return &NestedContextReader{readers, writer, ts}
}

func (n *NestedContextReader) Get(key string) (value.Value, bool) {
	for _, r := range n.readers {