org.apache.paimon.utils

Class ProjectedRow

java.lang.Object

org.apache.paimon.utils.ProjectedRow

All Implemented Interfaces:

DataGetters, InternalRow

public class ProjectedRow
extends Object
implements InternalRow

An implementation of InternalRow which provides a projected view of the underlying InternalRow.

Projection includes both reducing the accessible fields and reordering them.

Note: This class supports only top-level projections, not nested projections.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.paimon.data.InternalRow

InternalRow.FieldGetter

Field Summary

Fields

Modifier and Type	Field and Description
protected int[]	indexMapping
protected InternalRow	row

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ProjectedRow(int[] indexMapping)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
static ProjectedRow	from(int[] projection) Create an empty ProjectedRow starting from a projection array.
static ProjectedRow	from(int[][] projection) Like from(int[]), but throws IllegalArgumentException if the provided projection array contains nested projections, which are not supported by ProjectedRow.
static ProjectedRow	from(Projection projection) Create an empty ProjectedRow starting from a Projection.
InternalArray	getArray(int pos) Returns the array value at the given position.
byte[]	getBinary(int pos) Returns the binary value at the given position.
boolean	getBoolean(int pos) Returns the boolean value at the given position.
byte	getByte(int pos) Returns the byte value at the given position.
Decimal	getDecimal(int pos, int precision, int scale) Returns the decimal value at the given position.
double	getDouble(int pos) Returns the double value at the given position.
int	getFieldCount() Returns the number of fields in this row.
float	getFloat(int pos) Returns the float value at the given position.
int	getInt(int pos) Returns the integer value at the given position.
long	getLong(int pos) Returns the long value at the given position.
InternalMap	getMap(int pos) Returns the map value at the given position.
InternalRow	getRow(int pos, int numFields) Returns the row value at the given position.
RowKind	getRowKind() Returns the kind of change that this row describes in a changelog.
short	getShort(int pos) Returns the short value at the given position.
BinaryString	getString(int pos) Returns the string value at the given position.
Timestamp	getTimestamp(int pos, int precision) Returns the timestamp value at the given position.
int	hashCode()
boolean	isNullAt(int pos) Returns true if the element is null at the given position.
ProjectedRow	replaceRow(InternalRow row) Replaces the underlying InternalRow backing this ProjectedRow.
void	setRowKind(RowKind kind) Sets the kind of change that this row describes in a changelog.
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.paimon.data.InternalRow

createFieldGetter, getDataClass

Field Detail

indexMapping

protected final int[] indexMapping

row

protected InternalRow row

Constructor Detail

ProjectedRow

protected ProjectedRow(int[] indexMapping)

Method Detail

replaceRow

public ProjectedRow replaceRow(InternalRow row)

Replaces the underlying InternalRow backing this ProjectedRow.

This method replaces the row data in place and does not return a new object. This is done for performance reasons.

getFieldCount

public int getFieldCount()

Description copied from interface: InternalRow

Returns the number of fields in this row.

The number does not include RowKind. It is kept separately.

Specified by:

getFieldCount in interface InternalRow

getRowKind

public RowKind getRowKind()

Description copied from interface: InternalRow

Returns the kind of change that this row describes in a changelog.

Specified by:

getRowKind in interface InternalRow

See Also:

RowKind

setRowKind

public void setRowKind(RowKind kind)

Description copied from interface: InternalRow

Sets the kind of change that this row describes in a changelog.

Specified by:

setRowKind in interface InternalRow

See Also:

RowKind

isNullAt

public boolean isNullAt(int pos)

Description copied from interface: DataGetters

Returns true if the element is null at the given position.

Specified by:

isNullAt in interface DataGetters

getBoolean

public boolean getBoolean(int pos)

Description copied from interface: DataGetters

Returns the boolean value at the given position.

Specified by:

getBoolean in interface DataGetters

getByte

public byte getByte(int pos)

Description copied from interface: DataGetters

Returns the byte value at the given position.

Specified by:

getByte in interface DataGetters

getShort

public short getShort(int pos)

Description copied from interface: DataGetters

Returns the short value at the given position.

Specified by:

getShort in interface DataGetters

getInt

public int getInt(int pos)

Description copied from interface: DataGetters

Returns the integer value at the given position.

Specified by:

getInt in interface DataGetters

getLong

public long getLong(int pos)

Description copied from interface: DataGetters

Returns the long value at the given position.

Specified by:

getLong in interface DataGetters

getFloat

public float getFloat(int pos)

Description copied from interface: DataGetters

Returns the float value at the given position.

Specified by:

getFloat in interface DataGetters

getDouble

public double getDouble(int pos)

Description copied from interface: DataGetters

Returns the double value at the given position.

Specified by:

getDouble in interface DataGetters

getString

public BinaryString getString(int pos)

Description copied from interface: DataGetters

Returns the string value at the given position.

Specified by:

getString in interface DataGetters

getDecimal

public Decimal getDecimal(int pos,
                          int precision,
                          int scale)

Description copied from interface: DataGetters

Returns the decimal value at the given position.

The precision and scale are required to determine whether the decimal value was stored in a compact representation (see Decimal).

Specified by:

getDecimal in interface DataGetters

getTimestamp

public Timestamp getTimestamp(int pos,
                              int precision)

Description copied from interface: DataGetters

Returns the timestamp value at the given position.

The precision is required to determine whether the timestamp value was stored in a compact representation (see Timestamp).

Specified by:

getTimestamp in interface DataGetters

getBinary

public byte[] getBinary(int pos)

Description copied from interface: DataGetters

Returns the binary value at the given position.

Specified by:

getBinary in interface DataGetters

getArray

public InternalArray getArray(int pos)

Description copied from interface: DataGetters

Returns the array value at the given position.

Specified by:

getArray in interface DataGetters

getMap

public InternalMap getMap(int pos)

Description copied from interface: DataGetters

Returns the map value at the given position.

Specified by:

getMap in interface DataGetters

getRow

public InternalRow getRow(int pos,
                          int numFields)

Description copied from interface: DataGetters

Returns the row value at the given position.

The number of fields is required to correctly extract the row.

Specified by:

getRow in interface DataGetters

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

from

public static ProjectedRow from(int[][] projection)
                         throws IllegalArgumentException

Like from(int[]), but throws IllegalArgumentException if the provided projection array contains nested projections, which are not supported by ProjectedRow.

The array represents the mapping of the fields of the original DataType, including nested rows. For example, [[0, 2, 1], ...] specifies to include the 2nd field of the 3rd field of the 1st field in the top-level row.

Throws:

IllegalArgumentException

See Also:

Projection, ProjectedRow

from

public static ProjectedRow from(int[] projection)

Create an empty ProjectedRow starting from a projection array.

The array represents the mapping of the fields of the original DataType. For example, [0, 2, 1] specifies to include in the following order the 1st field, the 3rd field and the 2nd field of the row.

See Also:

Projection, ProjectedRow

from

public static ProjectedRow from(Projection projection)

Create an empty ProjectedRow starting from a Projection.

Throws IllegalStateException if the provided projection array contains nested projections, which are not supported by ProjectedRow.

See Also:

Projection, ProjectedRow