// Returns true if we can aggregate the data locally per shard,
// i.e. the group by interval lines up with the shard duration and
// there are no joins or merges
func (self *ShardData) ShouldAggregateLocally(querySpec *parser.QuerySpec) bool {
f := querySpec.GetFromClause()
if f != nil && (f.Type == parser.FromClauseInnerJoin || f.Type == parser.FromClauseMerge) {
return false
}
groupByInterval := querySpec.GetGroupByInterval()
if groupByInterval == nil {
if querySpec.HasAggregates() {
return false
}
return true
}
return (self.shardDuration%*groupByInterval == 0) && !querySpec.GroupByIrregularInterval
}