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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07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 available for \u003ccode\u003ePlanNode.Types.ChildLink\u003c/code\u003e is 5.0.0-beta05, with several previous versions also documented, ranging back to version 3.5.0.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003ePlanNode.Types.ChildLink\u003c/code\u003e is a class in the Google Cloud Spanner v1 API that represents metadata about a parent-child relationship in a \u003ccode\u003ePlanNode\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThis class implements multiple interfaces including \u003ccode\u003eIMessage\u003c/code\u003e, \u003ccode\u003eIEquatable\u003c/code\u003e, \u003ccode\u003eIDeepCloneable\u003c/code\u003e, and \u003ccode\u003eIBufferMessage\u003c/code\u003e, with methods for various operations.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eChildLink\u003c/code\u003e class has three properties, \u003ccode\u003eChildIndex\u003c/code\u003e, \u003ccode\u003eType\u003c/code\u003e, and \u003ccode\u003eVariable\u003c/code\u003e, that provide details about the linked node, link type, and output variable name respectively.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003ePlanNode.Types.ChildLink\u003c/code\u003e inherits from the base \u003ccode\u003eobject\u003c/code\u003e class, along with various methods from it, such as GetHashCode(), GetType(), and ToString().\u003c/p\u003e\n"]]],[],null,[]]
