org.apache.calcite.plan

Class MaterializedViewSubstitutionVisitor.FilterToFilterUnifyRule1

java.lang.Object

org.apache.calcite.plan.SubstitutionVisitor.UnifyRule

org.apache.calcite.plan.SubstitutionVisitor.AbstractUnifyRule

org.apache.calcite.plan.MaterializedViewSubstitutionVisitor.FilterToFilterUnifyRule1

Enclosing class:

MaterializedViewSubstitutionVisitor

private static class MaterializedViewSubstitutionVisitor.FilterToFilterUnifyRule1
extends SubstitutionVisitor.AbstractUnifyRule

Implementation of SubstitutionVisitor.UnifyRule that matches a MutableFilter to a MutableFilter where the condition of the target relation is weaker.

Example: target has a weaker condition

• query: Filter(condition: >($1, 20)) Scan(table: [hr, emps])
• target: Filter(condition: >($1, 10)) Scan(table: [hr, emps])

Field Summary

Fields

Modifier and Type	Field and Description
static MaterializedViewSubstitutionVisitor.FilterToFilterUnifyRule1	INSTANCE

Fields inherited from class org.apache.calcite.plan.SubstitutionVisitor.UnifyRule

queryOperand, slotCount, targetOperand

Constructor Summary

Constructors

Modifier	Constructor and Description
private	FilterToFilterUnifyRule1()

Method Summary

Modifier and Type	Method and Description
SubstitutionVisitor.UnifyResult	apply(SubstitutionVisitor.UnifyRuleCall call) Applies this rule to a particular node in a query.
protected SubstitutionVisitor.UnifyRuleCall	match(SubstitutionVisitor visitor, MutableRel query, MutableRel target)

Methods inherited from class org.apache.calcite.plan.SubstitutionVisitor.AbstractUnifyRule

any, isValid, operand, query, target

Methods inherited from class org.apache.calcite.plan.SubstitutionVisitor.UnifyRule

copy

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

INSTANCE

public static final MaterializedViewSubstitutionVisitor.FilterToFilterUnifyRule1 INSTANCE

Constructor Detail

FilterToFilterUnifyRule1

private FilterToFilterUnifyRule1()

Method Detail

apply

public SubstitutionVisitor.UnifyResult apply(SubstitutionVisitor.UnifyRuleCall call)

Description copied from class: SubstitutionVisitor.UnifyRule

Applies this rule to a particular node in a query. The goal is to convert query into target. Before the rule is invoked, Calcite has made sure that query's children are equivalent to target's children.

There are 3 possible outcomes:

• query already exactly matches target; returns target
• query is sufficiently close to a match for target; returns target
• query cannot be made to match target; returns null

REVIEW: Is possible that we match query PLUS one or more of its ancestors?

Specified by:

apply in class SubstitutionVisitor.UnifyRule

Parameters:

call - Input parameters

match

protected SubstitutionVisitor.UnifyRuleCall match(SubstitutionVisitor visitor,
                                                  MutableRel query,
                                                  MutableRel target)

Overrides:

match in class SubstitutionVisitor.UnifyRule