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

Class JoinDeriveNullFilterRule

java.lang.Object
org.apache.calcite.plan.RelOptRule
org.apache.calcite.plan.RelRule<JoinDeriveNullFilterRule.JoinDeriveNullFilterRuleConfig>
org.apache.flink.table.planner.plan.rules.logical.JoinDeriveNullFilterRule
@Enclosing public class JoinDeriveNullFilterRule extends org.apache.calcite.plan.RelRule<JoinDeriveNullFilterRule.JoinDeriveNullFilterRuleConfig>
Planner rule that filters null values before join if the count null value from join input is greater than null filter threshold.

Since the key of the Null value is impossible to match in the inner join, and there is a single point skew due to too many Null values. We should push down a not-null filter into the child node of join.

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Class
    Description
    static interface 
    JoinDeriveNullFilterRule.JoinDeriveNullFilterRuleConfig
    Rule configuration.

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

    org.apache.calcite.plan.RelRule.Config, 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 JoinDeriveNullFilterRule
    INSTANCE
     
    static final Long
    JOIN_NULL_FILTER_THRESHOLD
     

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

    config

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

    description, operands, relBuilderFactory

  • Method Summary

    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 Details

    • JOIN_NULL_FILTER_THRESHOLD

      public static final Long JOIN_NULL_FILTER_THRESHOLD

    • INSTANCE

      public static final JoinDeriveNullFilterRule INSTANCE

  • Method Details

    • 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