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.
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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["\u003cp\u003eThe \u003ccode\u003eChildLink\u003c/code\u003e class, part of the \u003ccode\u003eGoogle.Cloud.Spanner.V1\u003c/code\u003e namespace, represents metadata for parent-child relationships within a \u003ccode\u003ePlanNode\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version available for reference in the provided list is \u003ccode\u003e5.0.0-beta05\u003c/code\u003e, while the lowest is \u003ccode\u003e3.5.0\u003c/code\u003e and the current version displayed is \u003ccode\u003e3.6.0\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eChildLink\u003c/code\u003e implements interfaces like \u003ccode\u003eIMessage\u003c/code\u003e, \u003ccode\u003eIEquatable\u003c/code\u003e, \u003ccode\u003eIDeepCloneable\u003c/code\u003e, and \u003ccode\u003eIBufferMessage\u003c/code\u003e, demonstrating its role within the Google Protobuf framework.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eChildLink\u003c/code\u003e class has properties such as \u003ccode\u003eChildIndex\u003c/code\u003e, \u003ccode\u003eType\u003c/code\u003e, and \u003ccode\u003eVariable\u003c/code\u003e which describe the connection between nodes and the variables associated with them.\u003c/p\u003e\n"],["\u003cp\u003eThere is a constructor available for the \u003ccode\u003eChildLink\u003c/code\u003e class and a constructor that accepts a \u003ccode\u003ePlanNode.Types.ChildLink\u003c/code\u003e as a parameter.\u003c/p\u003e\n"]]],[],null,[]]
