org.apache.calcite.adapter.enumerable.impl

Class WinAggResultContextImpl

java.lang.Object

org.apache.calcite.adapter.enumerable.NestedBlockBuilderImpl

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

org.apache.calcite.adapter.enumerable.impl.AggResultContextImpl

org.apache.calcite.adapter.enumerable.impl.WinAggResultContextImpl

All Implemented Interfaces:

AggResetContext, AggResultContext, NestedBlockBuilder, WinAggFrameContext, WinAggFrameResultContext, WinAggResultContext

Direct Known Subclasses:

WinAggAddContextImpl

public abstract class WinAggResultContextImpl
extends AggResultContextImpl
implements WinAggResultContext

Implementation of WinAggResultContext.

Constructor Summary

Constructors

Constructor and Description
WinAggResultContextImpl(BlockBuilder block, List<Expression> accumulator, com.google.common.base.Function<BlockBuilder,WinAggFrameResultContext> frameContextBuilder) Creates window aggregate result context.

Method Summary

Methods

Modifier and Type	Method and Description
List<Expression>	arguments(Expression rowIndex) Returns Linq4j form of arguments.
Expression	compareRows(Expression a, Expression b) Compares two rows given by absolute positions according to the order collation of the current window.
Expression	computeIndex(Expression offset, WinAggImplementor.SeekType seekType) Converts absolute index position of the given relative position.
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	rowInFrame(Expression rowIndex) Returns boolean the expression that checks if the given index is in the frame bounds.
Expression	rowInPartition(Expression rowIndex) Returns boolean the expression that checks if the given index is in the partition bounds.
RexToLixTranslator	rowTranslator(Expression rowIndex) Returns row translator for given absolute row position.
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.WinAggResultContext

rexArguments

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

WinAggResultContextImpl

public WinAggResultContextImpl(BlockBuilder block,
                       List<Expression> accumulator,
                       com.google.common.base.Function<BlockBuilder,WinAggFrameResultContext> frameContextBuilder)

Creates window aggregate result context.

Parameters:

block - code block that will contain the added initialization

accumulator - accumulator variables that store the intermediate aggregate state

Method Detail

arguments

public final List<Expression> arguments(Expression rowIndex)

Description copied from interface: WinAggResultContext

Returns Linq4j form of arguments. The resulting value is equivalent to rowTranslator().translateList(rexArguments()). This is handy if you need just operate on argument.

Specified by:

arguments in interface WinAggResultContext

Parameters:

rowIndex - index of the requested row. The index must be in range of partition's startIndex and endIndex.

Returns:

Linq4j form of arguments of the particular row

computeIndex

public Expression computeIndex(Expression offset,
                      WinAggImplementor.SeekType seekType)

Description copied from interface: WinAggFrameResultContext

Converts absolute index position of the given relative position.

Specified by:

computeIndex in interface WinAggFrameResultContext

Parameters:

offset - offset of the requested row

seekType - the type of offset (start of window, end of window, etc)

Returns:

absolute position of the requested row

rowInFrame

public Expression rowInFrame(Expression rowIndex)

Description copied from interface: WinAggFrameResultContext

Returns boolean the expression that checks if the given index is in the frame bounds.

Specified by:

rowInFrame in interface WinAggFrameResultContext

Parameters:

rowIndex - index if the row to check

Returns:

expression that validates frame bounds for the given index

rowInPartition

public Expression rowInPartition(Expression rowIndex)

Description copied from interface: WinAggFrameResultContext

Returns boolean the expression that checks if the given index is in the partition bounds.

Specified by:

rowInPartition in interface WinAggFrameResultContext

Parameters:

rowIndex - index if the row to check

Returns:

expression that validates partition bounds for the given index

rowTranslator

public RexToLixTranslator rowTranslator(Expression rowIndex)

Description copied from interface: WinAggFrameResultContext

Returns row translator for given absolute row position.

Specified by:

rowTranslator in interface WinAggFrameResultContext

Parameters:

rowIndex - absolute index of the row.

Returns:

translator for the requested row

compareRows

public Expression compareRows(Expression a,
                     Expression b)

Description copied from interface: WinAggFrameResultContext

Compares two rows given by absolute positions according to the order collation of the current window.

Specified by:

compareRows in interface WinAggFrameResultContext

Parameters:

a - absolute index of the first row

b - absolute index of the second row

Returns:

result of comparison as as in Comparable.compareTo(T)

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