java.lang.Object
- org.apache.druid.frame.field.ComplexFieldReader

All Implemented Interfaces:

FieldReader
```
public class ComplexFieldReader
extends Object
implements FieldReader
```
Reads values written by ComplexFieldWriter. Format: - 1 byte: ComplexFieldWriter.NULL_BYTE or ComplexFieldWriter.NOT_NULL_BYTE - 4 bytes: length of serialized complex value, little-endian int - N bytes: serialized complex value

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static ComplexFieldReader`	`createFromType(ColumnType columnType)`
`boolean`	`isNull(org.apache.datasketches.memory.Memory memory, long position)`	Whether the provided memory position points to a null value.
`ColumnValueSelector<?>`	`makeColumnValueSelector(org.apache.datasketches.memory.Memory memory, ReadableFieldPointer fieldPointer)`	Create a `ColumnValueSelector` backed by some memory and a moveable pointer.
`DimensionSelector`	`makeDimensionSelector(org.apache.datasketches.memory.Memory memory, ReadableFieldPointer fieldPointer, ExtractionFn extractionFn)`	Create a `DimensionSelector` backed by some memory and a moveable pointer.
`static Object`	`readFieldFromByteArray(ComplexMetricSerde serde, byte[] bytes, int position)`	Alternative interface to read the field from the byte array without creating a selector and field pointer.
`static Object`	`readFieldFromMemory(ComplexMetricSerde serde, org.apache.datasketches.memory.Memory memory, long position)`	Alternative interface to read the field from the memory without creating a selector and field pointer

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

createFromType

public static ComplexFieldReader createFromType(ColumnType columnType)

makeColumnValueSelector

public ColumnValueSelector<?> makeColumnValueSelector(org.apache.datasketches.memory.Memory memory,
                                                      ReadableFieldPointer fieldPointer)

Description copied from interface: FieldReader

Create a ColumnValueSelector backed by some memory and a moveable pointer.

Specified by:: makeColumnValueSelector in interface FieldReader

makeDimensionSelector

public DimensionSelector makeDimensionSelector(org.apache.datasketches.memory.Memory memory,
                                               ReadableFieldPointer fieldPointer,
                                               @Nullable
                                               ExtractionFn extractionFn)

Description copied from interface: FieldReader

Create a DimensionSelector backed by some memory and a moveable pointer.

Specified by:: makeDimensionSelector in interface FieldReader

isNull
```
public boolean isNull(org.apache.datasketches.memory.Memory memory,
                      long position)
```
Description copied from interface: FieldReader

Whether the provided memory position points to a null value.

Specified by:

isNull in interface FieldReader

readFieldFromByteArray

@Nullable
public static Object readFieldFromByteArray(ComplexMetricSerde serde,
                                            byte[] bytes,
                                            int position)

Alternative interface to read the field from the byte array without creating a selector and field pointer. It is much faster than wrapping the byte array in Memory for reading.

readFieldFromMemory

@Nullable
public static Object readFieldFromMemory(ComplexMetricSerde serde,
                                         org.apache.datasketches.memory.Memory memory,
                                         long position)

Alternative interface to read the field from the memory without creating a selector and field pointer

Class ComplexFieldReader