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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07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\u003eThis webpage details the \u003ccode\u003eChildLink\u003c/code\u003e class within the \u003ccode\u003eGoogle.Cloud.Spanner.V1\u003c/code\u003e namespace, a component used for defining parent-child relationships in Spanner query execution plans.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eChildLink\u003c/code\u003e class implements several interfaces, including \u003ccode\u003eIMessage\u003c/code\u003e, \u003ccode\u003eIEquatable\u003c/code\u003e, \u003ccode\u003eIDeepCloneable\u003c/code\u003e, and \u003ccode\u003eIBufferMessage\u003c/code\u003e, indicating its role in data management and serialization.\u003c/p\u003e\n"],["\u003cp\u003eThe class has properties \u003ccode\u003eChildIndex\u003c/code\u003e, \u003ccode\u003eType\u003c/code\u003e, and \u003ccode\u003eVariable\u003c/code\u003e, which specify the linked node, the link type, and any associated output variable names, respectively.\u003c/p\u003e\n"],["\u003cp\u003eThe content is versioned with multiple releases listed, from version 3.5.0 up to the latest beta 5.0.0-beta05, which can be accessed by clicking the provided links for each version.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eChildLink\u003c/code\u003e class is documented to be constructable via a parameter-less method or from another instance of \u003ccode\u003eChildLink\u003c/code\u003e, allowing flexibility in implementation.\u003c/p\u003e\n"]]],[],null,[]]
