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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07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 Google Cloud Spanner v1 API is 5.0.0-beta05, with version 4.6.0 being the version currently focused on in the provided content.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003ePlanNode.Types.ChildLink\u003c/code\u003e class provides metadata about parent-child relationships within a \u003ccode\u003ePlanNode\u003c/code\u003e in the Google Cloud Spanner v1 API.\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.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003ePlanNode.Types.ChildLink\u003c/code\u003e class includes properties such as \u003ccode\u003eChildIndex\u003c/code\u003e, \u003ccode\u003eType\u003c/code\u003e, and \u003ccode\u003eVariable\u003c/code\u003e, providing details about the linked node, type, and associated output variable name.\u003c/p\u003e\n"],["\u003cp\u003eThere are multiple versions listed in this document, from 3.5.0 to 5.0.0-beta05, showing the evolution and different versions of this API class.\u003c/p\u003e\n"]]],[],null,[]]
