com.google.api.services.spanner.v1.model

Class ChildLink

java.lang.Object

java.util.AbstractMap<String,Object>

com.google.api.client.util.GenericData

com.google.api.client.json.GenericJson

com.google.api.services.spanner.v1.model.ChildLink

All Implemented Interfaces:

Cloneable, Map<String,Object>

public final class ChildLink
extends com.google.api.client.json.GenericJson

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

This is the Java data model class that specifies how to parse/serialize into the JSON that is transmitted over HTTP when working with the Cloud Spanner API. For a detailed explanation see: https://developers.google.com/api-client-library/java/google-http-java-client/json

Author:

Google, Inc.

Nested Class Summary

Nested classes/interfaces inherited from class com.google.api.client.util.GenericData

com.google.api.client.util.GenericData.Flags

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
ChildLink()

Method Summary

Modifier and Type	Method and Description
ChildLink	clone()
Integer	getChildIndex() The node to which the link points.
String	getType() The type of the link.
String	getVariable() Only present if the child node is SCALAR and corresponds to an output variable of the parent node.
ChildLink	set(String fieldName, Object value)
ChildLink	setChildIndex(Integer childIndex) The node to which the link points.
ChildLink	setType(String type) The type of the link.
ChildLink	setVariable(String variable) Only present if the child node is SCALAR and corresponds to an output variable of the parent node.

Methods inherited from class com.google.api.client.json.GenericJson

getFactory, setFactory, toPrettyString, toString

Methods inherited from class com.google.api.client.util.GenericData

entrySet, equals, get, getClassInfo, getUnknownKeys, hashCode, put, putAll, remove, setUnknownKeys

Methods inherited from class java.util.AbstractMap

clear, containsKey, containsValue, isEmpty, keySet, size, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Detail

ChildLink

public ChildLink()

Method Detail

getChildIndex

public Integer getChildIndex()

The node to which the link points.

Returns:

value or null for none

setChildIndex

public ChildLink setChildIndex(Integer childIndex)

The node to which the link points.

Parameters:

childIndex - childIndex or null for none

getType

public String 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:

value or null for none

setType

public ChildLink setType(String type)

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.

Parameters:

type - type or null for none

getVariable

public String 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:

value or null for none

setVariable

public ChildLink setVariable(String variable)

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.

Parameters:

variable - variable or null for none

set

public ChildLink set(String fieldName,
                     Object value)

Overrides:

set in class com.google.api.client.json.GenericJson

clone

public ChildLink clone()

Overrides:

clone in class com.google.api.client.json.GenericJson