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+// Copyright 2017 Google Inc.
+//
+// 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.
+
+syntax = "proto3";
+
+package google.spanner.v1;
+
+import "google/api/annotations.proto";
+import "google/protobuf/struct.proto";
+
+option csharp_namespace = "Google.Cloud.Spanner.V1";
+option go_package = "google.golang.org/genproto/googleapis/spanner/v1;spanner";
+option java_multiple_files = true;
+option java_outer_classname = "QueryPlanProto";
+option java_package = "com.google.spanner.v1";
+
+
+// Node information for nodes appearing in a [QueryPlan.plan_nodes][google.spanner.v1.QueryPlan.plan_nodes].
+message PlanNode {
+  // Metadata associated with a parent-child relationship appearing in a
+  // [PlanNode][google.spanner.v1.PlanNode].
+  message ChildLink {
+    // The node to which the link points.
+    int32 child_index = 1;
+
+    // The type of the link. For example, in Hash Joins this could be used to
+    // distinguish between the build child and the probe child, or in the case
+    // of the child being an output variable, to represent the tag associated
+    // with the output variable.
+    string type = 2;
+
+    // Only present if the child node is [SCALAR][google.spanner.v1.PlanNode.Kind.SCALAR] and corresponds
+    // to an output variable of the parent node. The field carries the name of
+    // the output variable.
+    // For example, a `TableScan` operator that reads rows from a table will
+    // have child links to the `SCALAR` nodes representing the output variables
+    // created for each column that is read by the operator. The corresponding
+    // `variable` fields will be set to the variable names assigned to the
+    // columns.
+    string variable = 3;
+  }
+
+  // Condensed representation of a node and its subtree. Only present for
+  // `SCALAR` [PlanNode(s)][google.spanner.v1.PlanNode].
+  message ShortRepresentation {
+    // A string representation of the expression subtree rooted at this node.
+    string description = 1;
+
+    // A mapping of (subquery variable name) -> (subquery node id) for cases
+    // where the `description` string of this node references a `SCALAR`
+    // subquery contained in the expression subtree rooted at this node. The
+    // referenced `SCALAR` subquery may not necessarily be a direct child of
+    // this node.
+    map<string, int32> subqueries = 2;
+  }
+
+  // The kind of [PlanNode][google.spanner.v1.PlanNode]. Distinguishes between the two different kinds of
+  // nodes that can appear in a query plan.
+  enum Kind {
+    // Not specified.
+    KIND_UNSPECIFIED = 0;
+
+    // Denotes a Relational operator node in the expression tree. Relational
+    // operators represent iterative processing of rows during query execution.
+    // For example, a `TableScan` operation that reads rows from a table.
+    RELATIONAL = 1;
+
+    // Denotes a Scalar node in the expression tree. Scalar nodes represent
+    // non-iterable entities in the query plan. For example, constants or
+    // arithmetic operators appearing inside predicate expressions or references
+    // to column names.
+    SCALAR = 2;
+  }
+
+  // The `PlanNode`'s index in [node list][google.spanner.v1.QueryPlan.plan_nodes].
+  int32 index = 1;
+
+  // Used to determine the type of node. May be needed for visualizing
+  // different kinds of nodes differently. For example, If the node is a
+  // [SCALAR][google.spanner.v1.PlanNode.Kind.SCALAR] node, it will have a condensed representation
+  // which can be used to directly embed a description of the node in its
+  // parent.
+  Kind kind = 2;
+
+  // The display name for the node.
+  string display_name = 3;
+
+  // List of child node `index`es and their relationship to this parent.
+  repeated ChildLink child_links = 4;
+
+  // Condensed representation for [SCALAR][google.spanner.v1.PlanNode.Kind.SCALAR] nodes.
+  ShortRepresentation short_representation = 5;
+
+  // Attributes relevant to the node contained in a group of key-value pairs.
+  // For example, a Parameter Reference node could have the following
+  // information in its metadata:
+  //
+  //     {
+  //       "parameter_reference": "param1",
+  //       "parameter_type": "array"
+  //     }
+  google.protobuf.Struct metadata = 6;
+
+  // The execution statistics associated with the node, contained in a group of
+  // key-value pairs. Only present if the plan was returned as a result of a
+  // profile query. For example, number of executions, number of rows/time per
+  // execution etc.
+  google.protobuf.Struct execution_stats = 7;
+}
+
+// Contains an ordered list of nodes appearing in the query plan.
+message QueryPlan {
+  // The nodes in the query plan. Plan nodes are returned in pre-order starting
+  // with the plan root. Each [PlanNode][google.spanner.v1.PlanNode]'s `id` corresponds to its index in
+  // `plan_nodes`.
+  repeated PlanNode plan_nodes = 1;
+}