org.apache.calcite.rel.externalize

Class RelJson

java.lang.Object

org.apache.calcite.rel.externalize.RelJson

public class RelJson
extends Object

Utilities for converting RelNode into JSON format.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	RelJson.InputTranslator Translates a JSON object that represents an input reference into a RexNode.

Field Summary

Fields

Modifier and Type	Field and Description
static List<String>	PACKAGES

Constructor Summary

Constructors

Constructor and Description
RelJson(@Nullable JsonBuilder jsonBuilder) Creates a RelJson.

Method Summary

Modifier and Type	Method and Description
String	classToTypeName(Class<? extends RelNode> class_) Inverse of typeNameToClass(java.lang.String).
RelNode	create(Map<String,Object> map)
Constructor	getConstructor(String type)
static RexNode	readExpression(RelOptCluster cluster, RelJson.InputTranslator translator, Map<String,Object> o) Translates a JSON expression into a RexNode, using a given RelJson.InputTranslator to transform JSON objects that represent input references into RexNodes.
RelCollation	toCollation(List<Map<String,Object>> jsonFieldCollations)
RelDistribution	toDistribution(Map<String,Object> map)
RelFieldCollation	toFieldCollation(Map<String,Object> map)
Object	toJson(AggregateCall node)
@Nullable Object	toJson(@Nullable Object value)
Object	toJson(RelCollationImpl node)
RelDataType	toType(RelDataTypeFactory typeFactory, Object o)
Class	typeNameToClass(String type) Converts a type name to a class.
RelJson	withInputTranslator(RelJson.InputTranslator inputTranslator) Returns a RelJson with a given InputTranslator.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

PACKAGES

public static final List<String> PACKAGES

Constructor Detail

RelJson

public RelJson(@Nullable JsonBuilder jsonBuilder)

Creates a RelJson.

Method Detail

withInputTranslator

public RelJson withInputTranslator(RelJson.InputTranslator inputTranslator)

Returns a RelJson with a given InputTranslator.

create

public RelNode create(Map<String,Object> map)

getConstructor

public Constructor getConstructor(String type)

typeNameToClass

public Class typeNameToClass(String type)

Converts a type name to a class. E.g. getClass("LogicalProject") returns LogicalProject.class.

classToTypeName

public String classToTypeName(Class<? extends RelNode> class_)

Inverse of typeNameToClass(java.lang.String).

toJson

public Object toJson(RelCollationImpl node)

toCollation

public RelCollation toCollation(List<Map<String,Object>> jsonFieldCollations)

toFieldCollation

public RelFieldCollation toFieldCollation(Map<String,Object> map)

toDistribution

public RelDistribution toDistribution(Map<String,Object> map)

toType

public RelDataType toType(RelDataTypeFactory typeFactory,
                          Object o)

toJson

public Object toJson(AggregateCall node)

toJson

public @Nullable Object toJson(@Nullable Object value)

readExpression

public static RexNode readExpression(RelOptCluster cluster,
                                     RelJson.InputTranslator translator,
                                     Map<String,Object> o)

Translates a JSON expression into a RexNode, using a given RelJson.InputTranslator to transform JSON objects that represent input references into RexNodes.

Parameters:

cluster - The optimization environment

translator - Input translator

o - JSON object

Returns:

the transformed RexNode