org.apache.flink.table.planner.plan.rules.logical

Class PushProjectIntoTableSourceScanRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

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

org.apache.flink.table.planner.plan.rules.logical.PushProjectIntoTableSourceScanRule

@Internal
 @Value.Enclosing
public class PushProjectIntoTableSourceScanRule
extends org.apache.calcite.plan.RelRule<PushProjectIntoTableSourceScanRule.Config>

Pushes a LogicalProject into a LogicalTableScan.

If the source implements SupportsProjectionPushDown this rule pushes the projection of physical columns into the source.

If the source implements SupportsReadingMetadata this rule also pushes projected metadata into the source. For sources implementing SupportsReadingMetadata but not SupportsProjectionPushDown this is only done if SupportsReadingMetadata.supportsMetadataProjection() returns true. This is important for some sources which would not be re-usable if different instances (due to different projected metadata) of the source were used together.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	PushProjectIntoTableSourceScanRule.Config Configuration for PushProjectIntoTableSourceScanRule.

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

org.apache.calcite.plan.RelRule.Done, org.apache.calcite.plan.RelRule.MatchHandler<R extends org.apache.calcite.plan.RelOptRule>, org.apache.calcite.plan.RelRule.OperandBuilder, org.apache.calcite.plan.RelRule.OperandDetailBuilder<R extends org.apache.calcite.rel.RelNode>, org.apache.calcite.plan.RelRule.OperandTransform

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

org.apache.calcite.plan.RelOptRule.ConverterRelOptRuleOperand

Field Summary

Fields

Modifier and Type	Field and Description
static PushProjectIntoTableSourceScanRule	INSTANCE

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

Constructor and Description
PushProjectIntoTableSourceScanRule(PushProjectIntoTableSourceScanRule.Config config)

Method Summary

Modifier and Type	Method and Description
boolean	matches(org.apache.calcite.plan.RelOptRuleCall call)
void	onMatch(org.apache.calcite.plan.RelOptRuleCall call)

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

any, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, 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 Detail

INSTANCE

public static final PushProjectIntoTableSourceScanRule INSTANCE

Constructor Detail

PushProjectIntoTableSourceScanRule

public PushProjectIntoTableSourceScanRule(PushProjectIntoTableSourceScanRule.Config config)

Method Detail

matches

public boolean matches(org.apache.calcite.plan.RelOptRuleCall call)

Overrides:

matches in class org.apache.calcite.plan.RelOptRule

onMatch

public void onMatch(org.apache.calcite.plan.RelOptRuleCall call)

Specified by:

onMatch in class org.apache.calcite.plan.RelOptRule