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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07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 \u003ccode\u003ePlanNode.Types.ChildLink\u003c/code\u003e class in the Google Cloud Spanner v1 API represents a parent-child relationship within a query plan.\u003c/p\u003e\n"],["\u003cp\u003eThis class 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 for managing data and object interactions.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version available is \u003ccode\u003e5.0.0-beta05\u003c/code\u003e, while the current version documented is \u003ccode\u003e4.3.0\u003c/code\u003e, and multiple previous versions are also listed, going back as far as version \u003ccode\u003e3.5.0\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eChildLink\u003c/code\u003e objects contain properties such as \u003ccode\u003eChildIndex\u003c/code\u003e, \u003ccode\u003eType\u003c/code\u003e, and \u003ccode\u003eVariable\u003c/code\u003e to define the specifics of the connection to other nodes.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eType\u003c/code\u003e property is a string that can differentiate between types of links, such as build or probe children in Hash Joins, and the \u003ccode\u003eVariable\u003c/code\u003e property indicates if the child is a scalar and represents an output variable of the parent node.\u003c/p\u003e\n"]]],[],null,[]]
