org.eigenbase.relopt
Class CommonRelSubExprRule

java.lang.Object
  org.eigenbase.relopt.RelOptRule
      org.eigenbase.relopt.CommonRelSubExprRule

Direct Known Subclasses:

FennelBufferCommonRelSubExprRule

public abstract class CommonRelSubExprRule
extends RelOptRule

A CommonRelSubExprRule is an abstract base class for rules that are fired only on relational expressions that appear more than once in a query tree.

Field Summary

Fields inherited from class org.eigenbase.relopt.RelOptRule

ANY, description, operands

Constructor Summary

CommonRelSubExprRule(RelOptRuleOperand operand)
Creates a CommonRelSubExprRule.

Method Summary

Methods inherited from class org.eigenbase.relopt.RelOptRule

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

Methods inherited from class java.lang.Object

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

Constructor Detail

CommonRelSubExprRule

public CommonRelSubExprRule(RelOptRuleOperand operand)

Creates a CommonRelSubExprRule.

Parameters:

operand - root operand, must not be null

"Precondition:"

operand != null