org.eigenbase.relopt
Class RelOptUtil.RexInputConverter

java.lang.Object
  org.eigenbase.rex.RexShuttle
      org.eigenbase.relopt.RelOptUtil.RexInputConverter

All Implemented Interfaces:

RexVisitor<RexNode>

Direct Known Subclasses:

PushProjector.RefAndExprConverter

Enclosing class:

RelOptUtil

public static class RelOptUtil.RexInputConverter
extends RexShuttle

Walks an expression tree, converting the index of RexInputRefs based on some adjustment factor.

Field Summary

private int[]	adjustments
protected RelDataTypeField[]	destFields
private RelDataTypeField[]	leftDestFields
private int	nLeftDestFields
protected RexBuilder	rexBuilder
private RelDataTypeField[]	rightDestFields
private RelDataTypeField[]	srcFields

Constructor Summary

	RelOptUtil.RexInputConverter(RexBuilder rexBuilder, RelDataTypeField[] srcFields, int[] adjustments)
	RelOptUtil.RexInputConverter(RexBuilder rexBuilder, RelDataTypeField[] srcFields, RelDataTypeField[] destFields, int[] adjustments)
	RelOptUtil.RexInputConverter(RexBuilder rexBuilder, RelDataTypeField[] srcFields, RelDataTypeField[] leftDestFields, RelDataTypeField[] rightDestFields, int[] adjustments)
private	RelOptUtil.RexInputConverter(RexBuilder rexBuilder, RelDataTypeField[] srcFields, RelDataTypeField[] destFields, RelDataTypeField[] leftDestFields, RelDataTypeField[] rightDestFields, int[] adjustments)

Method Summary

RexNode

visitInputRef(RexInputRef var)

Methods inherited from class org.eigenbase.rex.RexShuttle

apply, apply, visitArray, visitCall, visitCorrelVariable, visitDynamicParam, visitFieldAccess, 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

rexBuilder

protected final RexBuilder rexBuilder

srcFields

private final RelDataTypeField[] srcFields

destFields

protected final RelDataTypeField[] destFields

leftDestFields

private final RelDataTypeField[] leftDestFields

rightDestFields

private final RelDataTypeField[] rightDestFields

nLeftDestFields

private final int nLeftDestFields

adjustments

private final int[] adjustments

Constructor Detail

RelOptUtil.RexInputConverter

private RelOptUtil.RexInputConverter(RexBuilder rexBuilder,
                                     RelDataTypeField[] srcFields,
                                     RelDataTypeField[] destFields,
                                     RelDataTypeField[] leftDestFields,
                                     RelDataTypeField[] rightDestFields,
                                     int[] adjustments)

Parameters:

rexBuilder - builder for creating new RexInputRefs

srcFields - fields where the RexInputRefs originally originated from; if null, a new RexInputRef is always created, referencing the input from destFields corresponding to its current index value

destFields - fields that the new RexInputRefs will be referencing; if null, use the type information from the source field when creating the new RexInputRef

leftDestFields - in the case where the destination is a join, these are the fields from the left join input

rightDestFields - in the case where the destination is a join, these are the fields from the right join input

adjustments - the amount to adjust each field by

RelOptUtil.RexInputConverter

public RelOptUtil.RexInputConverter(RexBuilder rexBuilder,
                                    RelDataTypeField[] srcFields,
                                    RelDataTypeField[] leftDestFields,
                                    RelDataTypeField[] rightDestFields,
                                    int[] adjustments)

RelOptUtil.RexInputConverter

public RelOptUtil.RexInputConverter(RexBuilder rexBuilder,
                                    RelDataTypeField[] srcFields,
                                    RelDataTypeField[] destFields,
                                    int[] adjustments)

RelOptUtil.RexInputConverter

public RelOptUtil.RexInputConverter(RexBuilder rexBuilder,
                                    RelDataTypeField[] srcFields,
                                    int[] adjustments)

Method Detail

visitInputRef

public RexNode visitInputRef(RexInputRef var)

Specified by:

visitInputRef in interface RexVisitor<RexNode>

Overrides:

visitInputRef in class RexShuttle