com.facebook.presto.spi

Interface ColumnIdentity

public interface ColumnIdentity

A ColumnIdentity keeps all the information needed to determine if a column has changed for a certain table.

The ColumnIdentity is saved as serialized bytes.

ColumnIdentity can be used to ensure that the columns used in view definition have not changed since the view was created.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o) Compare the identity of columns, even for deserialized instances from different releases.
int	hashCode() Must be implemented to properly compare the equality of ColumnIdentity.
byte[]	serialize() Serialize the column identity in a manner which is backwards compatible across releases.

Method Detail

serialize

byte[] serialize()

Serialize the column identity in a manner which is backwards compatible across releases.

equals

boolean equals(Object o)

Compare the identity of columns, even for deserialized instances from different releases.

Overrides:

equals in class Object

hashCode

int hashCode()

Must be implemented to properly compare the equality of ColumnIdentity.

Overrides:

hashCode in class Object