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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07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 latest version of the \u003ccode\u003eGoogle.Cloud.Spanner.V1\u003c/code\u003e package is \u003ccode\u003e5.0.0-beta05\u003c/code\u003e, with multiple prior versions available ranging from \u003ccode\u003e5.0.0-beta04\u003c/code\u003e down to \u003ccode\u003e3.5.0\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eChildLink\u003c/code\u003e is a class representing the relationship between parent and child nodes within a \u003ccode\u003ePlanNode\u003c/code\u003e, as defined in the \u003ccode\u003eGoogle.Cloud.Spanner.V1\u003c/code\u003e namespace, and it implements interfaces such as \u003ccode\u003eIMessage\u003c/code\u003e, \u003ccode\u003eIEquatable\u003c/code\u003e, \u003ccode\u003eIDeepCloneable\u003c/code\u003e, and \u003ccode\u003eIBufferMessage\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eChildLink\u003c/code\u003e class has properties including \u003ccode\u003eChildIndex\u003c/code\u003e (an integer indicating the node the link is pointing to), \u003ccode\u003eType\u003c/code\u003e (a string describing the link type), and \u003ccode\u003eVariable\u003c/code\u003e (a string identifying the output variable name if the child node is scalar).\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eChildLink\u003c/code\u003e class includes two constructors: a default constructor and one that accepts another \u003ccode\u003eChildLink\u003c/code\u003e object as a parameter.\u003c/p\u003e\n"],["\u003cp\u003eThe content lists the assembly, namespace, implemented interfaces, inheritance, inherited members, constructors, and properties relating to the \u003ccode\u003eChildLink\u003c/code\u003e class, part of the \u003ccode\u003ePlanNode.Types\u003c/code\u003e in \u003ccode\u003eGoogle.Cloud.Spanner.V1\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,[]]
