Package org.apache.druid.sql.calcite.rule

Class FilterDecomposeCoalesceRule

java.lang.Object
org.apache.calcite.plan.RelOptRule
org.apache.druid.sql.calcite.rule.FilterDecomposeCoalesceRule
All Implemented Interfaces:
org.apache.calcite.rel.rules.SubstitutionRule, org.apache.calcite.rel.rules.TransformationRule
public class FilterDecomposeCoalesceRule extends org.apache.calcite.plan.RelOptRule implements org.apache.calcite.rel.rules.SubstitutionRule
Transform calls like f(COALESCE(x, y)) => (x IS NOT NULL AND f(x)) OR (x IS NULL AND f(y)), for boolean functions f. Only simple calls are transformed; see isSimpleCoalesce(RexNode) for a definition. This is because the main purpose of this decomposition is to make it more likely that we'll be able to use indexes when filtering.

  • Nested Class Summary

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

    org.apache.calcite.plan.RelOptRule.ConverterRelOptRuleOperand

  • Field Summary

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

    description, operands, relBuilderFactory

  • Constructor Summary

    Constructors
    Constructor
    Description
    FilterDecomposeCoalesceRule()
     

  • 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, 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

    Methods inherited from interface org.apache.calcite.rel.rules.SubstitutionRule

    autoPruneOld

  • Constructor Details

    • FilterDecomposeCoalesceRule

      public FilterDecomposeCoalesceRule()

  • Method Details

    • onMatch

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