Beispiel #1
0
// createTagSetsAndFields returns the tagsets and various fields given a measurement and
// SELECT statement.
func createTagSetsAndFields(m *Measurement, stmt *influxql.SelectStatement) (*tagSetsAndFields, error) {
	_, tagKeys, err := stmt.Dimensions.Normalize()
	if err != nil {
		return nil, err
	}

	sfs := newStringSet()
	sts := newStringSet()
	wfs := newStringSet()

	// Validate the fields and tags asked for exist and keep track of which are in the select vs the where
	for _, n := range stmt.NamesInSelect() {
		if m.HasField(n) {
			sfs.add(n)
			continue
		}
		if m.HasTagKey(n) {
			sts.add(n)
		}
	}

	for _, n := range stmt.NamesInDimension() {
		if m.HasTagKey(n) {
			tagKeys = append(tagKeys, n)
		}
	}

	for _, n := range stmt.NamesInWhere() {
		if n == "time" {
			continue
		}
		if m.HasField(n) {
			wfs.add(n)
			continue
		}
	}

	// Get the sorted unique tag sets for this statement.
	tagSets, err := m.TagSets(stmt, tagKeys)
	if err != nil {
		return nil, err
	}

	return &tagSetsAndFields{
		tagSets:      tagSets,
		selectFields: sfs.list(),
		selectTags:   sts.list(),
		whereFields:  wfs.list(),
	}, nil
}
Beispiel #2
0
// DimensionTagSets returns list of tag sets from the GROUP BY section of stmt.
func (m *Measurement) DimensionTagSets(stmt *influxql.SelectStatement) ([]*influxql.TagSet, error) {
	_, tagKeys := stmt.Dimensions.Normalize()

	for _, n := range stmt.NamesInDimension() {
		if m.HasTagKey(n) {
			tagKeys = append(tagKeys, n)
		}
	}

	// Get the sorted unique tag sets for this statement.
	tagSets, err := m.TagSets(stmt, tagKeys)
	if err != nil {
		return nil, err
	}
	return tagSets, nil
}