Class PlanNode (3.40.0)

Version 3.40.0

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PlanNode(mapping=None, *, ignore_unknown_fields=False, **kwargs)

Node information for nodes appearing in a QueryPlan.plan_nodes][google.spanner.v1.QueryPlan.plan_nodes].

Attributes
Name	Description
index	int The PlanNode's index in [node list][google.spanner.v1.QueryPlan.plan_nodes].
kind	google.cloud.spanner_v1.types.PlanNode.Kind 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.
display_name	str The display name for the node.
child_links	MutableSequence[google.cloud.spanner_v1.types.PlanNode.ChildLink] List of child node index\ es and their relationship to this parent.
short_representation	google.cloud.spanner_v1.types.PlanNode.ShortRepresentation Condensed representation for SCALAR][google.spanner.v1.PlanNode.Kind.SCALAR] nodes.
metadata	google.protobuf.struct_pb2.Struct 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" }
execution_stats	google.protobuf.struct_pb2.Struct 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.

Classes

ChildLink

ChildLink(mapping=None, *, ignore_unknown_fields=False, **kwargs)

Metadata associated with a parent-child relationship appearing in a PlanNode][google.spanner.v1.PlanNode].

Kind

Kind(value)

The kind of PlanNode][google.spanner.v1.PlanNode]. Distinguishes between the two different kinds of nodes that can appear in a query plan.

Values: KIND_UNSPECIFIED (0): Not specified. RELATIONAL (1): 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. SCALAR (2): 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.

ShortRepresentation

ShortRepresentation(mapping=None, *, ignore_unknown_fields=False, **kwargs)

Condensed representation of a node and its subtree. Only present for SCALAR [PlanNode(s)][google.spanner.v1.PlanNode].