/
resultset.go
70 lines (56 loc) · 1.66 KB
/
resultset.go
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package reads
import (
"context"
"github.com/influxdata/influxdb/models"
"github.com/influxdata/influxdb/tsdb/cursors"
)
type multiShardCursors interface {
createCursor(row SeriesRow) cursors.Cursor
}
type resultSet struct {
ctx context.Context
seriesCursor SeriesCursor
seriesRow SeriesRow
arrayCursors multiShardCursors
}
// TODO(jsternberg): The range is [start, end) for this function which is consistent
// with the documented interface for datatypes.ReadFilterRequest. This function should
// be refactored to take in a datatypes.ReadFilterRequest similar to the other
// ResultSet functions.
func NewFilteredResultSet(ctx context.Context, start, end int64, seriesCursor SeriesCursor) ResultSet {
return &resultSet{
ctx: ctx,
seriesCursor: seriesCursor,
arrayCursors: newMultiShardArrayCursors(ctx, start, end, true),
}
}
func (r *resultSet) Err() error { return nil }
// Close closes the result set. Close is idempotent.
func (r *resultSet) Close() {
if r == nil {
return // Nothing to do.
}
r.seriesRow.Query = nil
r.seriesCursor.Close()
}
// Next returns true if there are more results available.
func (r *resultSet) Next() bool {
if r == nil {
return false
}
seriesRow := r.seriesCursor.Next()
if seriesRow == nil {
return false
}
r.seriesRow = *seriesRow
return true
}
func (r *resultSet) Cursor() cursors.Cursor {
return r.arrayCursors.createCursor(r.seriesRow)
}
func (r *resultSet) Tags() models.Tags {
return r.seriesRow.Tags
}
// Stats returns the stats for the underlying cursors.
// Available after resultset has been scanned.
func (r *resultSet) Stats() cursors.CursorStats { return r.seriesRow.Query.Stats() }