Package io.substrait.relation

Class Expand

java.lang.Object

io.substrait.relation.AbstractRel

io.substrait.relation.SingleInputRel

io.substrait.relation.Expand

All Implemented Interfaces:

Rel

Direct Known Subclasses:

ImmutableExpand

@Enclosing
@Immutable
public abstract class Expand
extends SingleInputRel

Expands the input relation into a set of projected fields where each field is either consistent or switches among duplicate expressions.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Expand.ConsistentField	A field whose value is defined by a single expression.
static interface	Expand.ExpandField	A field produced by the expand operation.
static class	Expand.SwitchingField	A field that may switch among duplicate expressions; nullability propagates if any duplicate is nullable.

Nested classes/interfaces inherited from interface io.substrait.relation.Rel

Rel.Remap

Constructor Summary

Constructors

Constructor	Description
Expand()

Method Summary

Modifier and Type	Method	Description
<O, C extends VisitationContext, E extends Exception> O	accept(RelVisitor<O,C,E> visitor, C context)	Accepts a relation visitor.
static ImmutableExpand.Builder	builder()	Creates a builder for Expand.
Type.Struct	deriveRecordType()	Derives the output record type from the expand fields.
abstract List<Expand.ExpandField>	getFields()	Returns the fields produced by the expand operation.

Methods inherited from class io.substrait.relation.SingleInputRel

getInput, getInputs

Methods inherited from class io.substrait.relation.AbstractRel

getRecordType

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.substrait.relation.Rel

getCommonExtension, getHint, getRemap

Constructor Details

Expand

public Expand()

Method Details

getFields

public abstract List<Expand.ExpandField> getFields()

Returns the fields produced by the expand operation.

Returns:

the list of expand fields

deriveRecordType

public Type.Struct deriveRecordType()

Derives the output record type from the expand fields.

Specified by:

deriveRecordType in class AbstractRel

Returns:

the resulting struct type

accept

public <O,
C extends VisitationContext,
E extends Exception>
O accept(RelVisitor<O,C,E> visitor,
 C context)
  throws E

Accepts a relation visitor.

Type Parameters:

O - the result type

C - the visitation context type

E - the exception type that may be thrown

Parameters:

visitor - the relation visitor

context - the visitation context

Returns:

the visit result

Throws:

E - if the visitor signals an error

builder

public static ImmutableExpand.Builder builder()

Creates a builder for Expand.

Returns:

a new immutable builder