com.facebook.presto.spi.function

Interface AccumulatorStateSerializer<T>

public interface AccumulatorStateSerializer<T>

Method Summary

Modifier and Type	Method and Description
void	deserialize(Block block, int index, T state) Deserialize index-th position in block into state.
Type	getSerializedType()
void	serialize(T state, BlockBuilder out)

Method Detail

getSerializedType

Type getSerializedType()

serialize

void serialize(T state,
               BlockBuilder out)

deserialize

void deserialize(Block block,
                 int index,
                 T state)

Deserialize index-th position in block into state.

This method may be invoked with a reused dirty state. Therefore, implementations must not make assumptions about the initial value of state.

Null positions in block are skipped and ignored. In other words, block.isNull(index) is guaranteed to return false.