Cloud Spanner V1 Client - Class ChildLink (1.82.0)

Version 1.82.0

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Reference documentation and code samples for the Cloud Spanner V1 Client class ChildLink.

Metadata associated with a parent-child relationship appearing in a PlanNode.

Generated from protobuf message google.spanner.v1.PlanNode.ChildLink

Namespace

Google \ Cloud \ Spanner \ V1 \ PlanNode

Methods

__construct

Constructor.

Parameters
Name	Description
data	array Optional. Data for populating the Message object.
↳ child_index	int The node to which the link points.
↳ type	string 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.
↳ variable	string Only present if the child node is 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.

getChildIndex

The node to which the link points.

Returns
Type	Description
int

setChildIndex

The node to which the link points.

Parameter
Name	Description
var	int

Returns
Type	Description
$this

getType

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.

Returns
Type	Description
string

setType

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.

Parameter
Name	Description
var	string

Returns
Type	Description
$this

getVariable

Only present if the child node is 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.

Returns
Type	Description
string

setVariable

Only present if the child node is 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.

Parameter
Name	Description
var	string

Returns
Type	Description
$this