org.bytedeco.arrow_dataset

Class FieldExpression

java.lang.Object

org.bytedeco.javacpp.Pointer

org.bytedeco.arrow_dataset.Expression

org.bytedeco.arrow_dataset.FieldExpression

All Implemented Interfaces:

AutoCloseable

@Namespace(value="arrow::dataset")
 @NoOffset
 @Properties(inherit=arrow_dataset.class)
public class FieldExpression
extends Expression

Represents a reference to a field. Stores only the field's name (type and other information is known only when a Schema is provided)

Nested Class Summary

Nested classes/interfaces inherited from class org.bytedeco.javacpp.Pointer

Pointer.CustomDeallocator, Pointer.Deallocator, Pointer.NativeDeallocator, Pointer.ReferenceCounter

Field Summary

Fields inherited from class org.bytedeco.javacpp.Pointer

address, capacity, limit, position

Constructor Summary

Constructors

Constructor and Description
FieldExpression(BytePointer name)
FieldExpression(Pointer p) Pointer cast constructor.
FieldExpression(String name)

Method Summary

Modifier and Type	Method and Description
Expression	Copy() Copy this expression into a shared pointer.
boolean	Equals(Expression other) Returns true iff the expressions are identical; does not check for equivalence.
String	name()
String	ToString() returns a debug string representing this expression
DataTypeResult	Validate(Schema schema) Validate this expression for execution against a schema.

Methods inherited from class org.bytedeco.arrow_dataset.Expression

Assume, CastLike, CastLike, CastTo, CastTo, In, IsNull, IsValid, type

Methods inherited from class org.bytedeco.javacpp.Pointer

address, asBuffer, asByteBuffer, availablePhysicalBytes, calloc, capacity, capacity, close, deallocate, deallocate, deallocateReferences, deallocator, deallocator, equals, fill, formatBytes, free, hashCode, isNull, isNull, limit, limit, malloc, maxBytes, maxPhysicalBytes, memchr, memcmp, memcpy, memmove, memset, offsetof, parseBytes, physicalBytes, position, position, put, realloc, referenceCount, releaseReference, retainReference, setNull, sizeof, toString, totalBytes, totalPhysicalBytes, withDeallocator, zero

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldExpression

public FieldExpression(Pointer p)

Pointer cast constructor. Invokes Pointer.Pointer(Pointer).

FieldExpression

public FieldExpression(@StdString
                       String name)

FieldExpression

public FieldExpression(@StdString
                       BytePointer name)

Method Detail

name

@StdString
public String name()

ToString

@StdString
public String ToString()

Description copied from class: Expression

returns a debug string representing this expression

Overrides:

ToString in class Expression

Equals

@Cast(value="bool")
public boolean Equals(@Const @ByRef
                                          Expression other)

Description copied from class: Expression

Returns true iff the expressions are identical; does not check for equivalence. For example, (A and B) is not equal to (B and A) nor is (A and not A) equal to (false).

Overrides:

Equals in class Expression

Validate

@ByVal
public DataTypeResult Validate(@Const @ByRef
                                      Schema schema)

Description copied from class: Expression

Validate this expression for execution against a schema. This will check that all reference fields are present (fields not in the schema will be replaced with null) and all subexpressions are executable. Returns the type to which this expression will evaluate.

Overrides:

Validate in class Expression

Copy

@SharedPtr
 @ByVal
public Expression Copy()

Description copied from class: Expression

Copy this expression into a shared pointer.

Overrides:

Copy in class Expression