org.eigenbase.oj.rel
Class IterRules.HomogeneousUnionToIteratorRule

java.lang.Object
  org.eigenbase.relopt.RelOptRule
      org.eigenbase.rel.convert.ConverterRule
          org.eigenbase.oj.rel.IterRules.UnionToIteratorRule
              org.eigenbase.oj.rel.IterRules.HomogeneousUnionToIteratorRule

Enclosing class:

IterRules

public static class IterRules.HomogeneousUnionToIteratorRule
extends IterRules.UnionToIteratorRule

Refinement of IterRules.UnionToIteratorRule which only applies to a UnionRel all of whose input rows are the same type as its output row. Luckily, a CoerceInputsRule will have made that happen.

Field Summary

static IterRules.HomogeneousUnionToIteratorRule

instance

Fields inherited from class org.eigenbase.relopt.RelOptRule

ANY, description, operands

Constructor Summary

private	IterRules.HomogeneousUnionToIteratorRule() Creates a HomogeneousUnionToIteratorRule.
protected	IterRules.HomogeneousUnionToIteratorRule(String description)

Method Summary

RelNode

convert(RelNode rel)

Methods inherited from class org.eigenbase.oj.rel.IterRules.UnionToIteratorRule

newIterConcatenateRel

Methods inherited from class org.eigenbase.rel.convert.ConverterRule

getInTrait, getOutConvention, getOutTrait, getTraitDef, isGuaranteed, onMatch

Methods inherited from class org.eigenbase.relopt.RelOptRule

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

Methods inherited from class java.lang.Object

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

Field Detail

instance

public static final IterRules.HomogeneousUnionToIteratorRule instance

Constructor Detail

IterRules.HomogeneousUnionToIteratorRule

private IterRules.HomogeneousUnionToIteratorRule()

Creates a HomogeneousUnionToIteratorRule.

IterRules.HomogeneousUnionToIteratorRule

protected IterRules.HomogeneousUnionToIteratorRule(String description)

Method Detail

convert

public RelNode convert(RelNode rel)

Overrides:

convert in class IterRules.UnionToIteratorRule