Package 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 @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
    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
    Description
    static final 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
    Description
    PushCalcPastChangelogNormalizeRule(PushCalcPastChangelogNormalizeRule.Config config)
     

  • Method Summary

    Modifier and Type
    Method
    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 Details

    • INSTANCE

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

  • Constructor Details

  • Method Details

    • onMatch

      public void onMatch(org.apache.calcite.plan.RelOptRuleCall call)
      Specified by:
      onMatch in class org.apache.calcite.plan.RelOptRule