github.com/cockroachdb/cockroach@v20.2.0-alpha.1+incompatible/pkg/sql/sort.go (about)

     1  // Copyright 2015 The Cockroach Authors.
     2  //
     3  // Use of this software is governed by the Business Source License
     4  // included in the file licenses/BSL.txt.
     5  //
     6  // As of the Change Date specified in that file, in accordance with
     7  // the Business Source License, use of this software will be governed
     8  // by the Apache License, Version 2.0, included in the file
     9  // licenses/APL.txt.
    10  
    11  package sql
    12  
    13  import (
    14  	"context"
    15  
    16  	"github.com/cockroachdb/cockroach/pkg/sql/sem/tree"
    17  	"github.com/cockroachdb/cockroach/pkg/sql/sqlbase"
    18  )
    19  
    20  // sortNode represents a node that sorts the rows returned by its
    21  // sub-node.
    22  type sortNode struct {
    23  	plan     planNode
    24  	ordering sqlbase.ColumnOrdering
    25  	// When alreadyOrderedPrefix is non-zero, the input is already ordered on
    26  	// the prefix ordering[:alreadyOrderedPrefix].
    27  	alreadyOrderedPrefix int
    28  }
    29  
    30  func (n *sortNode) startExec(runParams) error {
    31  	panic("sortNode cannot be run in local mode")
    32  }
    33  
    34  func (n *sortNode) Next(params runParams) (bool, error) {
    35  	panic("sortNode cannot be run in local mode")
    36  }
    37  
    38  func (n *sortNode) Values() tree.Datums {
    39  	panic("sortNode cannot be run in local mode")
    40  }
    41  
    42  func (n *sortNode) Close(ctx context.Context) {
    43  	n.plan.Close(ctx)
    44  }