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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
Methods
__construct
Constructor.
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.
Generated from protobuf field int32 child_index = 1;
int
setChildIndex
The node to which the link points.
Generated from protobuf field int32 child_index = 1;
var
int
$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.
Generated from protobuf field string type = 2;
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.
Generated from protobuf field string type = 2;
var
string
$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.
Generated from protobuf field string variable = 3;
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.
Generated from protobuf field string variable = 3;
var
string
$this
