forked from cockroachdb/cockroach
/
delayed.go
46 lines (40 loc) · 1.64 KB
/
delayed.go
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// Copyright 2016 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
//
// Author: Raphael 'kena' Poss (knz@cockroachlabs.com)
package sql
import "github.com/cockroachdb/cockroach/pkg/sql/parser"
// delayedNode wraps a planNode in cases where the planNode
// constructor must be delayed during query execution (as opposed to
// SQL prepare) for resource tracking purposes.
type delayedNode struct {
name string
columns ResultColumns
constructor nodeConstructor
plan planNode
}
type nodeConstructor func(p *planner) (planNode, error)
func (d *delayedNode) Close() {
if d.plan != nil {
d.plan.Close()
d.plan = nil
}
}
func (d *delayedNode) Columns() ResultColumns { return d.columns }
func (d *delayedNode) Ordering() orderingInfo { return orderingInfo{} }
func (d *delayedNode) MarkDebug(_ explainMode) {}
func (d *delayedNode) Start() error { return d.plan.Start() }
func (d *delayedNode) Next() (bool, error) { return d.plan.Next() }
func (d *delayedNode) Values() parser.Datums { return d.plan.Values() }
func (d *delayedNode) DebugValues() debugValues { return d.plan.DebugValues() }