org.apache.calcite.adapter.enumerable.impl

Class WinAggResetContextImpl

java.lang.Object

org.apache.calcite.adapter.enumerable.NestedBlockBuilderImpl

org.apache.calcite.adapter.enumerable.impl.AggResetContextImpl

org.apache.calcite.adapter.enumerable.impl.WinAggResetContextImpl

All Implemented Interfaces:

AggResetContext, NestedBlockBuilder, WinAggFrameContext, WinAggResetContext

public class WinAggResetContextImpl
extends AggResetContextImpl
implements WinAggResetContext

Implementation of WinAggResetContext.

Constructor Summary

Constructors

Constructor and Description
WinAggResetContextImpl(BlockBuilder block, List<Expression> accumulator, Expression index, Expression startIndex, Expression endIndex, Expression hasRows, Expression frameRowCount, Expression partitionRowCount) Creates window aggregate reset context.

Method Summary

Methods

Modifier and Type	Method and Description
Expression	endIndex() Returns the index of the very last row in partition.
Expression	getFrameRowCount() Returns the number of rows in the current frame (subject to framing clause).
Expression	getPartitionRowCount() Returns the number of rows in the current partition (as determined by PARTITION BY clause).
Expression	hasRows() Returns the boolean expression that tells if the partition has rows.
Expression	index() Returns the index of the current row in the partition.
Expression	startIndex() Returns the index of the very first row in partition.

Methods inherited from class org.apache.calcite.adapter.enumerable.impl.AggResetContextImpl

accumulator

Methods inherited from class org.apache.calcite.adapter.enumerable.NestedBlockBuilderImpl

currentBlock, currentNullables, exitBlock, nestBlock, nestBlock, nestBlock

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.calcite.adapter.enumerable.AggResetContext

accumulator

Methods inherited from interface org.apache.calcite.adapter.enumerable.NestedBlockBuilder

currentBlock, currentNullables, exitBlock, nestBlock, nestBlock, nestBlock

Constructor Detail

WinAggResetContextImpl

public WinAggResetContextImpl(BlockBuilder block,
                      List<Expression> accumulator,
                      Expression index,
                      Expression startIndex,
                      Expression endIndex,
                      Expression hasRows,
                      Expression frameRowCount,
                      Expression partitionRowCount)

Creates window aggregate reset context.

Parameters:

block - code block that will contain the added initialization

accumulator - accumulator variables that store the intermediate aggregate state

index - index of the current row in the partition

startIndex - index of the very first row in partition

endIndex - index of the very last row in partition

hasRows - boolean expression that tells if the partition has rows

frameRowCount - number of rows in the current frame

partitionRowCount - number of rows in the current partition

Method Detail

index

public Expression index()

Description copied from interface: WinAggFrameContext

Returns the index of the current row in the partition. In other words, it is close to ~ROWS BETWEEN CURRENT ROW. Note to use WinAggFrameContext.startIndex() when you need zero-based row position.

Specified by:

index in interface WinAggFrameContext

Returns:

the index of the very first row in partition

startIndex

public Expression startIndex()

Description copied from interface: WinAggFrameContext

Returns the index of the very first row in partition.

Specified by:

startIndex in interface WinAggFrameContext

Returns:

index of the very first row in partition

endIndex

public Expression endIndex()

Description copied from interface: WinAggFrameContext

Returns the index of the very last row in partition.

Specified by:

endIndex in interface WinAggFrameContext

Returns:

index of the very last row in partition

hasRows

public Expression hasRows()

Description copied from interface: WinAggFrameContext

Returns the boolean expression that tells if the partition has rows. The partition might lack rows in cases like ROWS BETWEEN 1000 PRECEDING AND 900 PRECEDING.

Specified by:

hasRows in interface WinAggFrameContext

Returns:

boolean expression that tells if the partition has rows

getFrameRowCount

public Expression getFrameRowCount()

Description copied from interface: WinAggFrameContext

Returns the number of rows in the current frame (subject to framing clause).

Specified by:

getFrameRowCount in interface WinAggFrameContext

Returns:

number of rows in the current partition or 0 if the partition is empty

getPartitionRowCount

public Expression getPartitionRowCount()

Description copied from interface: WinAggFrameContext

Returns the number of rows in the current partition (as determined by PARTITION BY clause).

Specified by:

getPartitionRowCount in interface WinAggFrameContext

Returns:

number of rows in the current partition or 0 if the partition is empty