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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07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, a component of the \u003ccode\u003eGoogle.Cloud.Spanner.V1\u003c/code\u003e namespace, specifically related to parent-child relationships within a \u003ccode\u003ePlanNode\u003c/code\u003e.\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, and inherits basic functionalities from the \u003ccode\u003eObject\u003c/code\u003e class.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eChildLink\u003c/code\u003e class includes constructors to create new instances, either blank or from an existing \u003ccode\u003eChildLink\u003c/code\u003e object.\u003c/p\u003e\n"],["\u003cp\u003eKey properties of the \u003ccode\u003eChildLink\u003c/code\u003e class include \u003ccode\u003eChildIndex\u003c/code\u003e to identify the linked node, \u003ccode\u003eType\u003c/code\u003e to specify the relationship type, and \u003ccode\u003eVariable\u003c/code\u003e to name an output variable if the child is a scalar node.\u003c/p\u003e\n"],["\u003cp\u003eThe webpage also lists the different versions of the \u003ccode\u003eChildLink\u003c/code\u003e class, from the latest beta version \u003ccode\u003e5.0.0-beta05\u003c/code\u003e down to version \u003ccode\u003e3.5.0\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,[]]
