Metadata associated with a parent-child relationship appearing in a
PlanNode][google.spanner.v1.PlanNode].
Attributes
Name
Description
child_index
int
The node to which the link points.
type_
str
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.
variable
str
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.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2026-05-09 UTC."],[],[]]
