PushProjectIntoTableSourceScanRule (Flink : 2.0-SNAPSHOT API)

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
@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 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 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 Description

PushProjectIntoTableSourceScanRule(PushProjectIntoTableSourceScanRule.Config config)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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