Reference documentation and code samples for the Cloud Spanner V1 API class Google::Cloud::Spanner::V1::PlanNode::ChildLink.
Metadata associated with a parent-child relationship appearing in a PlanNode.
Inherits
- Object
Extended By
- Google::Protobuf::MessageExts::ClassMethods
Includes
- Google::Protobuf::MessageExts
Methods
#child_index
def child_index() -> ::Integer
Returns
- (::Integer) — The node to which the link points.
#child_index=
def child_index=(value) -> ::Integer
Parameter
- value (::Integer) — The node to which the link points.
Returns
- (::Integer) — The node to which the link points.
#type
def type() -> ::String
Returns
- (::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.
#type=
def type=(value) -> ::String
Parameter
- value (::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.
Returns
- (::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
def variable() -> ::String
Returns
-
(::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
TableScanoperator that reads rows from a table will have child links to theSCALARnodes representing the output variables created for each column that is read by the operator. The correspondingvariablefields will be set to the variable names assigned to the columns.
#variable=
def variable=(value) -> ::String
Parameter
-
value (::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
TableScanoperator that reads rows from a table will have child links to theSCALARnodes representing the output variables created for each column that is read by the operator. The correspondingvariablefields will be set to the variable names assigned to the columns.
Returns
-
(::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
TableScanoperator that reads rows from a table will have child links to theSCALARnodes representing the output variables created for each column that is read by the operator. The correspondingvariablefields will be set to the variable names assigned to the columns.