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

     1  // Copyright 2018 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 execinfra
    12  
    13  // OpNode is an interface to operator-like structures with children.
    14  type OpNode interface {
    15  	// ChildCount returns the number of children (inputs) of the operator.
    16  	ChildCount(verbose bool) int
    17  
    18  	// Child returns the nth child (input) of the operator.
    19  	Child(nth int, verbose bool) OpNode
    20  }