org.apache.flink.table.runtime.operators.over.frame

Class OffsetOverFrame

java.lang.Object

org.apache.flink.table.runtime.operators.over.frame.OffsetOverFrame

All Implemented Interfaces:

Serializable, OverWindowFrame

public class OffsetOverFrame
extends Object
implements OverWindowFrame

The offset window frame calculates frames containing LEAD/LAG statements.

See LeadLagAggFunction.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	OffsetOverFrame.CalcOffsetFunc Calc offset from base row.

Constructor Summary

Constructors

Constructor and Description
OffsetOverFrame(GeneratedAggsHandleFunction aggsHandleFunction, Long offset, OffsetOverFrame.CalcOffsetFunc calcOffsetFunc)

Method Summary

Modifier and Type	Method and Description
void	open(ExecutionContext ctx) Open to init with ExecutionContext.
void	prepare(ResettableExternalBuffer rows) Prepare for next partition.
RowData	process(int index, RowData current) return the ACC of the window frame.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.flink.table.runtime.operators.over.frame.OverWindowFrame

getNextOrNull

Constructor Detail

OffsetOverFrame

public OffsetOverFrame(GeneratedAggsHandleFunction aggsHandleFunction,
                       Long offset,
                       OffsetOverFrame.CalcOffsetFunc calcOffsetFunc)

Parameters:

aggsHandleFunction - the aggregate function

offset - it means the offset within a partition if calcOffsetFunc is null.

calcOffsetFunc - calculate the real offset when the function is not null.

Method Detail

open

public void open(ExecutionContext ctx)
          throws Exception

Description copied from interface: OverWindowFrame

Open to init with ExecutionContext.

Specified by:

open in interface OverWindowFrame

Throws:

Exception

prepare

public void prepare(ResettableExternalBuffer rows)
             throws Exception

Description copied from interface: OverWindowFrame

Prepare for next partition.

Specified by:

prepare in interface OverWindowFrame

Throws:

Exception

process

public RowData process(int index,
                       RowData current)
                throws Exception

Description copied from interface: OverWindowFrame

return the ACC of the window frame.

Specified by:

process in interface OverWindowFrame

Throws:

Exception