Package org.apache.calcite.adapter.arrow

Class ArrowRules.ArrowProjectRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelRule<ConverterRule.Config>

org.apache.calcite.rel.convert.ConverterRule

org.apache.calcite.adapter.arrow.ArrowRules.ArrowProjectRule

Enclosing class:

ArrowRules

public static class ArrowRules.ArrowProjectRule
extends ConverterRule

Planner rule that projects from an ArrowTableScan just the columns needed to satisfy a projection. If the projection's expressions are trivial, the projection is removed.

See Also:

• ArrowRules.PROJECT_SCAN

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.calcite.rel.convert.ConverterRule

ConverterRule.Config

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelRule

RelRule.Done, RelRule.MatchHandler<R extends RelOptRule>, RelRule.OperandBuilder, RelRule.OperandDetailBuilder<R extends RelNode>, RelRule.OperandTransform

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelOptRule

RelOptRule.ConverterRelOptRuleOperand

Field Summary

Fields

Modifier and Type	Field	Description
protected static final ConverterRule.Config	DEFAULT_CONFIG	Default configuration.

Fields inherited from class org.apache.calcite.rel.convert.ConverterRule

out

Fields inherited from class org.apache.calcite.plan.RelRule

config

Fields inherited from class org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ArrowProjectRule(ConverterRule.Config config)	Creates an ArrowProjectRule.

Method Summary

Modifier and Type	Method	Description
@Nullable RelNode	convert(RelNode rel)	Converts a relational expression to the target trait(s) of this rule.

Methods inherited from class org.apache.calcite.rel.convert.ConverterRule

getInTrait, getOutConvention, getOutTrait, getTraitDef, isGuaranteed, onMatch

Methods inherited from class org.apache.calcite.plan.RelOptRule

any, convert, convert, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_CONFIG

protected static final ConverterRule.Config DEFAULT_CONFIG

Default configuration.

Constructor Details

ArrowProjectRule

protected ArrowProjectRule(ConverterRule.Config config)

Creates an ArrowProjectRule.

Method Details

convert

public @Nullable RelNode convert(RelNode rel)

Description copied from class: ConverterRule

Converts a relational expression to the target trait(s) of this rule.

Returns null if conversion is not possible.

Specified by:

convert in class ConverterRule