org.apache.flink.table.planner.plan.rules.physical.stream

Class PushCalcPastChangelogNormalizeRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

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

org.apache.flink.table.planner.plan.rules.physical.stream.PushCalcPastChangelogNormalizeRule

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

Pushes primary key filters and used fields project through a ChangelogNormalize operator to reduce its state size.

This rule looks for Calc → ChangelogNormalize where the Calc contains a filter condition or a projection. The condition is transformed into CNF and then each conjunction is tested for whether it affects only primary key columns. If such conditions or projection exist, they are moved into a new, separate Calc and pushed through the ChangelogNormalize operator. ChangelogNormalize keeps state for every unique key it encounters, thus pushing filters on the primary key and projection on values in front of it helps reduce the size of its state.

Note that pushing primary key filters is safe to do, but pushing any other filters can lead to incorrect results.

Nested Class Summary

Nested Classes

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

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 org.apache.calcite.plan.RelOptRule	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
PushCalcPastChangelogNormalizeRule(PushCalcPastChangelogNormalizeRule.Config config)

Method Summary

Modifier and Type	Method and Description
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, 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 Detail

INSTANCE

public static final org.apache.calcite.plan.RelOptRule INSTANCE

Constructor Detail

PushCalcPastChangelogNormalizeRule

public PushCalcPastChangelogNormalizeRule(PushCalcPastChangelogNormalizeRule.Config config)

Method Detail

onMatch

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

Specified by:

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