net.sf.farrago.fennel.rel
Class FennelWindowRule

java.lang.Object
  org.eigenbase.relopt.RelOptRule
      net.sf.farrago.fennel.rel.FennelWindowRule

public abstract class FennelWindowRule
extends RelOptRule

FennelWindowRule is a rule for implementing a CalcRel which contains windowed aggregates via a FennelWindowRel.

There are several instances of the rule (CalcOnWinOnCalc, CalcOnWin, WinOnCalc, Win), which pull in any CalcRel objects above or below. (It may be better to write a rule which merges CalcRel and WindowedAggregateRel objects together, thereby dealing with this problem at the logical level.)

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/fennel/rel/FennelWindowRule.java#3 $

Author:

jhyde

Field Summary

static FennelWindowRule	CalcOnWin Instance of the rule which matches a CalcRel on top of a WindowedAggregateRel.
static FennelWindowRule	CalcOnWinOnCalc Instance of the rule which matches CalcRel on top of WindowedAggregateRel on top of CalcRel.
static FennelWindowRule	Win Instance of the rule which matches a WindowedAggregateRel on top of a RelNode.
static FennelWindowRule	WinOnCalc Instance of the rule which matches a WindowedAggregateRel on top of a CalcRel.

Fields inherited from class org.eigenbase.relopt.RelOptRule

ANY, description, operands

Constructor Summary

private

FennelWindowRule(RelOptRuleOperand operand, String description) Creates a FennelWindowRule.

Method Summary

private FennelWindowRel.RexWinAggCall	addWindows(List<FennelWindowRel.Window> windowList, RexOver over, RexProgramBuilder programBuilder)
protected void	createRels(RelOptRuleCall call, CalcRel outCalc, WindowedAggregateRel winAggRel, CalcRel inCalc, RelNode child)
CallingConvention	getOutConvention() Returns the calling convention of the result of firing this rule, null if not known.
private Integer[]	getProjectOrdinals(RexProgramBuilder programBuilder, RexNode[] exprs) Converts a list of expressions into a list of ordinals that these expressions are projected from a RexProgramBuilder.
private boolean	isPartitioningOnCalcField(CalcRel inCalc, List<FennelWindowRel.Window> windowList) Returns whether any of the partitions in windowList uses a field calculated in inCalc.
private FennelWindowRel.Window	lookupWindow(List<FennelWindowRel.Window> windowList, boolean physical, SqlNode lowerBound, SqlNode upperBound, Integer[] orderKeys)

Methods inherited from class org.eigenbase.relopt.RelOptRule

convert, equals, equals, getOperand, getOperands, getOutTrait, hashCode, matches, mergeTraitsAndConvert, mergeTraitsAndConvert, onMatch, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

CalcOnWinOnCalc

public static final FennelWindowRule CalcOnWinOnCalc

Instance of the rule which matches CalcRel on top of WindowedAggregateRel on top of CalcRel.

CalcOnWin

public static final FennelWindowRule CalcOnWin

Instance of the rule which matches a CalcRel on top of a WindowedAggregateRel.

WinOnCalc

public static final FennelWindowRule WinOnCalc

Instance of the rule which matches a WindowedAggregateRel on top of a CalcRel.

Win

public static final FennelWindowRule Win

Instance of the rule which matches a WindowedAggregateRel on top of a RelNode.

Constructor Detail

FennelWindowRule

private FennelWindowRule(RelOptRuleOperand operand,
                         String description)

Creates a FennelWindowRule.

Parameters:

operand - root operand, must not be null

description - Description, or null to guess description

Method Detail

getOutConvention

public CallingConvention getOutConvention()

Description copied from class: RelOptRule

Returns the calling convention of the result of firing this rule, null if not known.

Overrides:

getOutConvention in class RelOptRule

createRels

protected void createRels(RelOptRuleCall call,
                          CalcRel outCalc,
                          WindowedAggregateRel winAggRel,
                          CalcRel inCalc,
                          RelNode child)

isPartitioningOnCalcField

private boolean isPartitioningOnCalcField(CalcRel inCalc,
                                          List<FennelWindowRel.Window> windowList)

Returns whether any of the partitions in windowList uses a field calculated in inCalc.

Parameters:

inCalc - Calculator relational expression

windowList - List of windows

Returns:

Whether any partition has a calculated field

addWindows

private FennelWindowRel.RexWinAggCall addWindows(List<FennelWindowRel.Window> windowList,
                                                 RexOver over,
                                                 RexProgramBuilder programBuilder)

getProjectOrdinals

private Integer[] getProjectOrdinals(RexProgramBuilder programBuilder,
                                     RexNode[] exprs)

Converts a list of expressions into a list of ordinals that these expressions are projected from a RexProgramBuilder. If an expression is not projected, adds it.

Parameters:

programBuilder - Program builder

exprs - List of expressions

Returns:

List of ordinals where expressions are projected

lookupWindow

private FennelWindowRel.Window lookupWindow(List<FennelWindowRel.Window> windowList,
                                            boolean physical,
                                            SqlNode lowerBound,
                                            SqlNode upperBound,
                                            Integer[] orderKeys)