Package org.apache.calcite.rex

Class RexTransformer

java.lang.Object

org.apache.calcite.rex.RexTransformer

public class RexTransformer
extends java.lang.Object

Takes a tree of RexNode objects and transforms it into another in one sense equivalent tree. Nodes in tree will be modified and hence tree will not remain unchanged.

NOTE: You must validate the tree of RexNodes before using this class.

Field Summary

Fields

Modifier and Type	Field	Description
private int	isParentsCount
private RexBuilder	rexBuilder
private RexNode	root
private java.util.Set<SqlOperator>	transformableOperators

Constructor Summary

Constructors

Constructor	Description
RexTransformer(RexNode root, RexBuilder rexBuilder)

Method Summary

Modifier and Type	Method	Description
private boolean	isBoolean(RexNode node)
private boolean	isNullable(RexNode node)
private boolean	isTransformable(RexNode node)
RexNode	transformNullSemantics()
private RexNode	transformNullSemantics(RexNode node)

Methods inherited from class java.lang.Object

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

Field Detail

root

private RexNode root

rexBuilder

private final RexBuilder rexBuilder

isParentsCount

private int isParentsCount

transformableOperators

private final java.util.Set<SqlOperator> transformableOperators

Constructor Detail

RexTransformer

public RexTransformer(RexNode root,
                      RexBuilder rexBuilder)

Method Detail

isBoolean

private boolean isBoolean(RexNode node)

isNullable

private boolean isNullable(RexNode node)

isTransformable

private boolean isTransformable(RexNode node)

transformNullSemantics

public RexNode transformNullSemantics()

transformNullSemantics

private RexNode transformNullSemantics(RexNode node)