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

类 OffsetOverFrame

java.lang.Object

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

所有已实现的接口:

Serializable, OverWindowFrame

public class OffsetOverFrame
extends Object
implements OverWindowFrame

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

See LeadLagAggFunction.

另请参阅:

序列化表格

嵌套类概要

嵌套类

限定符和类型	类和说明
static interface	OffsetOverFrame.CalcOffsetFunc Calc offset from base row.

构造器概要

构造器

构造器和说明
OffsetOverFrame(GeneratedAggsHandleFunction aggsHandleFunction, Long offset, OffsetOverFrame.CalcOffsetFunc calcOffsetFunc)

方法概要

限定符和类型	方法和说明
void	open(ExecutionContext ctx) Open to init with ExecutionContext.
void	prepare(ResettableExternalBuffer rows) Prepare for next partition.
org.apache.flink.table.data.RowData	process(int index, org.apache.flink.table.data.RowData current) return the ACC of the window frame.

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.flink.table.runtime.operators.over.frame.OverWindowFrame

getNextOrNull

构造器详细资料

OffsetOverFrame

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

参数:

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.

方法详细资料

open

public void open(ExecutionContext ctx)
          throws Exception

从接口复制的说明: OverWindowFrame

Open to init with ExecutionContext.

指定者:

open 在接口中 OverWindowFrame

抛出:

Exception

prepare

public void prepare(ResettableExternalBuffer rows)
             throws Exception

从接口复制的说明: OverWindowFrame

Prepare for next partition.

指定者:

prepare 在接口中 OverWindowFrame

抛出:

Exception

process

public org.apache.flink.table.data.RowData process(int index,
                                                   org.apache.flink.table.data.RowData current)
                                            throws Exception

从接口复制的说明: OverWindowFrame

return the ACC of the window frame.

指定者:

process 在接口中 OverWindowFrame

抛出:

Exception