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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07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 page provides documentation for the \u003ccode\u003ePlanNode.Types.ChildLink\u003c/code\u003e class within the Google Cloud Spanner v1 API, focusing on various versions of this class.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eChildLink\u003c/code\u003e represents metadata associated with a parent-child relationship in a \u003ccode\u003ePlanNode\u003c/code\u003e, detailing how nodes are connected.\u003c/p\u003e\n"],["\u003cp\u003eThe class \u003ccode\u003eChildLink\u003c/code\u003e includes properties such as \u003ccode\u003eChildIndex\u003c/code\u003e, \u003ccode\u003eType\u003c/code\u003e, and \u003ccode\u003eVariable\u003c/code\u003e, which describe the linked child node, the relationship's type, and output variable names respectively.\u003c/p\u003e\n"],["\u003cp\u003eThe available versions range from \u003ccode\u003e5.0.0-beta05\u003c/code\u003e (latest) down to \u003ccode\u003e3.5.0\u003c/code\u003e, offering different iterations of the \u003ccode\u003ePlanNode.Types.ChildLink\u003c/code\u003e class.\u003c/p\u003e\n"],["\u003cp\u003eThe current version covered on the page in detail, is version \u003ccode\u003e4.1.0\u003c/code\u003e of the \u003ccode\u003eChildLink\u003c/code\u003e class.\u003c/p\u003e\n"]]],[],null,[]]
