org.eigenbase.rel.rules
Class ReduceDecimalsRule.DecimalShuttle

java.lang.Object
  org.eigenbase.rex.RexShuttle
      org.eigenbase.rel.rules.ReduceDecimalsRule.DecimalShuttle

All Implemented Interfaces:

RexVisitor<RexNode>

Enclosing class:

ReduceDecimalsRule

public class ReduceDecimalsRule.DecimalShuttle
extends RexShuttle

A shuttle which converts decimal expressions to expressions based on longs.

Field Summary

private ReduceDecimalsRule.ExpanderMap	expanderMap
private Map<String,RexNode>	irreducible
private Map<String,RexNode>	results

Constructor Summary

ReduceDecimalsRule.DecimalShuttle(RexBuilder rexBuilder)

Method Summary

private ReduceDecimalsRule.RexExpander	getExpander(RexCall call) Returns a ReduceDecimalsRule.RexExpander for a call
private RexNode	lookup(RexNode node) Lookup registered node
private void	register(RexNode node, RexNode reducedNode) Registers node so it will not be computed again
private RexNode	rewriteCall(RexCall call) Rewrites a call, if required, or returns the original call
RexNode	visitCall(RexCall call) Rewrites a call in place, from bottom up, as follows: visit operands visit call node rewrite call visit the rewritten call

Methods inherited from class org.eigenbase.rex.RexShuttle

apply, apply, visitArray, visitCorrelVariable, visitDynamicParam, visitFieldAccess, visitInputRef, visitLiteral, visitLocalRef, visitOver, visitRangeRef, visitWindow

Methods inherited from class java.lang.Object

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

Field Detail

irreducible

private final Map<String,RexNode> irreducible

results

private final Map<String,RexNode> results

expanderMap

private final ReduceDecimalsRule.ExpanderMap expanderMap

Constructor Detail

ReduceDecimalsRule.DecimalShuttle

public ReduceDecimalsRule.DecimalShuttle(RexBuilder rexBuilder)

Method Detail

visitCall

public RexNode visitCall(RexCall call)

Rewrites a call in place, from bottom up, as follows:

1. visit operands
2. visit call node
   1. rewrite call
   2. visit the rewritten call

Specified by:

visitCall in interface RexVisitor<RexNode>

Overrides:

visitCall in class RexShuttle

register

private void register(RexNode node,
                      RexNode reducedNode)

Registers node so it will not be computed again

lookup

private RexNode lookup(RexNode node)

Lookup registered node

rewriteCall

private RexNode rewriteCall(RexCall call)

Rewrites a call, if required, or returns the original call

getExpander

private ReduceDecimalsRule.RexExpander getExpander(RexCall call)

Returns a ReduceDecimalsRule.RexExpander for a call