org.apache.calcite.rex

Class RexPermuteInputsShuttle

java.lang.Object

org.apache.calcite.rex.RexShuttle

org.apache.calcite.rex.RexPermuteInputsShuttle

All Implemented Interfaces:

RexVisitor<RexNode>

public class RexPermuteInputsShuttle
extends RexShuttle

Shuttle which applies a permutation to its input fields.

See Also:

RexPermutationShuttle, RexUtil.apply(org.apache.calcite.util.mapping.Mappings.TargetMapping, RexNode)

Field Summary

Fields

Modifier and Type	Field and Description
private com.google.common.collect.ImmutableList<RelDataTypeField>	fields
private Mappings.TargetMapping	mapping

Constructor Summary

Constructors

Modifier	Constructor and Description
private	RexPermuteInputsShuttle(Mappings.TargetMapping mapping, com.google.common.collect.ImmutableList<RelDataTypeField> fields)
	RexPermuteInputsShuttle(Mappings.TargetMapping mapping, RelNode... inputs) Creates a RexPermuteInputsShuttle.

Method Summary

Modifier and Type	Method and Description
private static com.google.common.collect.ImmutableList<RelDataTypeField>	fields(RelNode[] inputs)
private static int	lookup(List<RelDataTypeField> fields, String name)
static RexPermuteInputsShuttle	of(Mappings.TargetMapping mapping) Creates a shuttle with an empty field list.
RexNode	visitCall(RexCall call)
RexNode	visitInputRef(RexInputRef local)

Methods inherited from class org.apache.calcite.rex.RexShuttle

apply, apply, apply, mutate, visitArray, visitCorrelVariable, visitDynamicParam, visitFieldAccess, visitFieldCollations, visitList, visitList, visitLiteral, visitLocalRef, visitOver, visitPatternFieldRef, visitRangeRef, visitSubQuery, visitTableInputRef, visitWindow

Methods inherited from class java.lang.Object

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

Field Detail

mapping

private final Mappings.TargetMapping mapping

fields

private final com.google.common.collect.ImmutableList<RelDataTypeField> fields

Constructor Detail

RexPermuteInputsShuttle

public RexPermuteInputsShuttle(Mappings.TargetMapping mapping,
                               RelNode... inputs)

Creates a RexPermuteInputsShuttle.

The mapping provides at most one target for every source. If a source has no targets and is referenced in the expression, Mappings.TargetMapping.getTarget(int) will give an error. Otherwise the mapping gives a unique target.

Parameters:

mapping - Mapping

inputs - Input relational expressions

RexPermuteInputsShuttle

private RexPermuteInputsShuttle(Mappings.TargetMapping mapping,
                                com.google.common.collect.ImmutableList<RelDataTypeField> fields)

Method Detail

of

public static RexPermuteInputsShuttle of(Mappings.TargetMapping mapping)

Creates a shuttle with an empty field list. It cannot handle GET calls but otherwise works OK.

fields

private static com.google.common.collect.ImmutableList<RelDataTypeField> fields(RelNode[] inputs)

visitInputRef

public RexNode visitInputRef(RexInputRef local)

Specified by:

visitInputRef in interface RexVisitor<RexNode>

Overrides:

visitInputRef in class RexShuttle

visitCall

public RexNode visitCall(RexCall call)

Specified by:

visitCall in interface RexVisitor<RexNode>

Overrides:

visitCall in class RexShuttle

lookup

private static int lookup(List<RelDataTypeField> fields,
                          String name)