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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07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 document provides reference information for the \u003ccode\u003ePlanNode.Types.ChildLink\u003c/code\u003e class within the Google Cloud Spanner v1 API, detailing its properties, inheritance, and implemented interfaces.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eChildLink\u003c/code\u003e class represents metadata about a parent-child relationship in a \u003ccode\u003ePlanNode\u003c/code\u003e, with properties like \u003ccode\u003eChildIndex\u003c/code\u003e, \u003ccode\u003eType\u003c/code\u003e, and \u003ccode\u003eVariable\u003c/code\u003e to describe the link and associated node.\u003c/p\u003e\n"],["\u003cp\u003eThe 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, supporting message handling, comparison, deep cloning, and buffer operations.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation covers various versions of the API, including beta releases, with the most recent being version \u003ccode\u003e5.0.0-beta05\u003c/code\u003e, and the main scope is version 4.2.0.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eChildLink\u003c/code\u003e class contains two constructors: a default constructor and a copy constructor, enabling creating new instances with or without existing data.\u003c/p\u003e\n"]]],[],null,[]]
