mirror of
https://github.com/featurebasedb/featurebase.git
synced 2026-08-28 10:54:59 +00:00
74ee3ebf0e
* implemented distinct
* implemented distinct
* uses first cut of a buffer pool, and extendible hashing with thresholded spill to disk
* tests
* cleaned up some stuff around query plan output to make developing tooling easier
* added optimization to call PQL Distinct()
* fixed test
* fix for passing wrong index name in orchestrator
* back out change to DistinctTimestamp
* fix other instance of wrong table name being passed
* use full index name instead of abbreviated one for translation. sigh.
* removed some unused code
Co-authored-by: Matthew Jaffee <jaffee@pilosa.com>
(cherry picked from commit f030d58d95)
69 lines
1.5 KiB
Go
69 lines
1.5 KiB
Go
// Copyright 2022 Molecula Corp. All rights reserved.
|
|
|
|
package planner
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
|
|
"github.com/featurebasedb/featurebase/v3/sql3/planner/types"
|
|
)
|
|
|
|
// PlanOpNullTable is an operator for a null table
|
|
// basically when you do select 1, you're using the null table
|
|
type PlanOpNullTable struct {
|
|
warnings []string
|
|
}
|
|
|
|
func NewPlanOpNullTable() *PlanOpNullTable {
|
|
return &PlanOpNullTable{
|
|
warnings: make([]string, 0),
|
|
}
|
|
}
|
|
|
|
func (p *PlanOpNullTable) Schema() types.Schema {
|
|
return types.Schema{}
|
|
}
|
|
|
|
func (p *PlanOpNullTable) Iterator(ctx context.Context, row types.Row) (types.RowIterator, error) {
|
|
return &nullTableIterator{}, nil
|
|
}
|
|
|
|
func (p *PlanOpNullTable) WithChildren(children ...types.PlanOperator) (types.PlanOperator, error) {
|
|
return NewPlanOpNullTable(), nil
|
|
}
|
|
|
|
func (p *PlanOpNullTable) Children() []types.PlanOperator {
|
|
return []types.PlanOperator{}
|
|
}
|
|
|
|
func (p *PlanOpNullTable) Plan() map[string]interface{} {
|
|
result := make(map[string]interface{})
|
|
result["_op"] = fmt.Sprintf("%T", p)
|
|
result["_schema"] = p.Schema().Plan()
|
|
return result
|
|
}
|
|
|
|
func (p *PlanOpNullTable) String() string {
|
|
return ""
|
|
}
|
|
|
|
func (p *PlanOpNullTable) AddWarning(warning string) {
|
|
p.warnings = append(p.warnings, warning)
|
|
}
|
|
|
|
func (p *PlanOpNullTable) Warnings() []string {
|
|
return p.warnings
|
|
}
|
|
|
|
type nullTableIterator struct {
|
|
rowConsumed bool
|
|
}
|
|
|
|
func (i *nullTableIterator) Next(ctx context.Context) (types.Row, error) {
|
|
if !i.rowConsumed {
|
|
i.rowConsumed = true
|
|
return make([]interface{}, 0), nil
|
|
}
|
|
return nil, types.ErrNoMoreRows
|
|
}
|