Package 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	Description
static interface	RelJson.InputTranslator	Translates a JSON object that represents an input reference into a RexNode.

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
RelJson(@Nullable JsonBuilder jsonBuilder)	Deprecated. Use create(), followed by withJsonBuilder(org.apache.calcite.util.JsonBuilder) if jsonBuilder is not null.

Method Summary

Modifier and Type	Method	Description
String	classToTypeName(Class<? extends RelNode> class_)	Inverse of typeNameToClass(java.lang.String).
static RelJson	create()	Creates a RelJson.
RelNode	create(Map<String,Object> map)
Constructor	getConstructor(String type)
static <C extends Comparable<C>> com.google.common.collect.Range<C>	rangeFromJson(List<String> list)	Creates a Range from a JSON object.
static <C extends Comparable<C>> com.google.common.collect.RangeSet<C>	rangeSetFromJson(List<List<String>> rangeSetsJson)	Converts a JSON list to a RangeSet.
static RexNode	readExpression(RelOptCluster cluster, RelJson.InputTranslator translator, Map<String,Object> o)	Deprecated. Use toRex(RelOptCluster, Object)
static <C extends Comparable<C>> Sarg<C>	sargFromJson(Map<String,Object> map)	Converts a JSON object to a Sarg.
RelCollation	toCollation(List<Map<String,Object>> jsonFieldCollations)
RelDistribution	toDistribution(Map<String,Object> map)
RelFieldCollation	toFieldCollation(Map<String,Object> map)
<C extends Comparable<C>> List<String>	toJson(com.google.common.collect.Range<C> range)	Serializes a Range that can be deserialized using rangeFromJson(List).
<C extends Comparable<C>> List<List<String>>	toJson(com.google.common.collect.RangeSet<C> rangeSet)
@Nullable Object	toJson(@Nullable Object value)
Object	toJson(AggregateCall node)
Object	toJson(RelCollationImpl node)
Object	toJson(RexNode node)
<C extends Comparable<C>> Object	toJson(Sarg<C> node)
RexNode	toRex(RelOptCluster cluster, Object o)	Translates a JSON expression into a RexNode.
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.
RelJson	withJsonBuilder(JsonBuilder jsonBuilder)	Returns a RelJson with a given JsonBuilder.
RelJson	withLibraryOperatorTable()	Returns a RelJson with an operator table that consists of the standard operators plus operators in all libraries.
RelJson	withOperatorTable(SqlOperatorTable operatorTable)	Returns a RelJson with a given operator table.

Methods inherited from class java.lang.Object

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

Field Details

PACKAGES

public static final List<String> PACKAGES

Constructor Details

RelJson

@Deprecated
public RelJson(@Nullable JsonBuilder jsonBuilder)

Deprecated.

Use create(), followed by withJsonBuilder(org.apache.calcite.util.JsonBuilder) if jsonBuilder is not null.

Creates a RelJson.

Method Details

create

public static RelJson create()

Creates a RelJson.

withJsonBuilder

public RelJson withJsonBuilder(JsonBuilder jsonBuilder)

Returns a RelJson with a given JsonBuilder.

withInputTranslator

public RelJson withInputTranslator(RelJson.InputTranslator inputTranslator)

Returns a RelJson with a given InputTranslator.

withOperatorTable

public RelJson withOperatorTable(SqlOperatorTable operatorTable)

Returns a RelJson with a given operator table.

withLibraryOperatorTable

public RelJson withLibraryOperatorTable()

Returns a RelJson with an operator table that consists of the standard operators plus operators in all libraries.

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)

toJson

public <C extends Comparable<C>> Object toJson(Sarg<C> node)

toJson

public <C extends Comparable<C>> List<List<String>> toJson(com.google.common.collect.RangeSet<C> rangeSet)

toJson

public <C extends Comparable<C>> List<String> toJson(com.google.common.collect.Range<C> range)

Serializes a Range that can be deserialized using rangeFromJson(List).

toJson

public Object toJson(RexNode node)

toRex

public RexNode toRex(RelOptCluster cluster,
 Object o)

Translates a JSON expression into a RexNode.

Parameters:

cluster - The optimization environment

o - JSON object

Returns:

the transformed RexNode

sargFromJson

public static <C extends Comparable<C>> Sarg<C> sargFromJson(Map<String,Object> map)

Converts a JSON object to a Sarg.

For example, {rangeSet: [["[", 0, 5, "]"], ["[", 10, "-", ")"]], nullAs: "UNKNOWN"} represents the range x ≥ 0 and x ≤ 5 or x > 10.

rangeSetFromJson

public static <C extends Comparable<C>>
com.google.common.collect.RangeSet<C> rangeSetFromJson(List<List<String>> rangeSetsJson)

Converts a JSON list to a RangeSet.

rangeFromJson

public static <C extends Comparable<C>>
com.google.common.collect.Range<C> rangeFromJson(List<String> list)

Creates a Range from a JSON object.

The JSON object is as serialized using toJson(Range), e.g. ["[", ")", 10, "-"].

See Also:

• RelJson.RangeToJsonConverter

readExpression

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

Deprecated.

Use toRex(RelOptCluster, Object)

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