// createTagSetsAndFields returns the tagsets and various fields given a measurement and
// SELECT statement.
func createTagSetsAndFields(c *Conversation, stmt *sql.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 c.HasField(n) {
sfs.add(n)
continue
}
if c.HasTagKey(n) {
sts.add(n)
tagKeys = append(tagKeys, n)
}
}
for _, n := range stmt.NamesInWhere() {
if n == "time" {
continue
}
if c.HasField(n) {
wfs.add(n)
continue
}
}
// Get the sorted unique tag sets for this statement.
// tagSets, err := c.TagSets(stmt, tagKeys)
// if err != nil {
// return nil, err
// }
return &tagSetsAndFields{
// tagSets: tagSets,
selectFields: sfs.list(),
selectTags: sts.list(),
whereFields: wfs.list(),
}, nil
}
