MaterializedViewSubstitutionVisitor.FilterToProjectUnifyRule1 (Apache Calcite API)

java.lang.Object
- org.apache.calcite.plan.SubstitutionVisitor.UnifyRule
- - org.apache.calcite.plan.SubstitutionVisitor.AbstractUnifyRule
  - - org.apache.calcite.plan.MaterializedViewSubstitutionVisitor.FilterToProjectUnifyRule1

Enclosing class:

MaterializedViewSubstitutionVisitor
```
private static class MaterializedViewSubstitutionVisitor.FilterToProjectUnifyRule1
extends SubstitutionVisitor.AbstractUnifyRule
```
Implementation of SubstitutionVisitor.UnifyRule that matches a MutableFilter to a MutableProject on top of a MutableFilter where the condition of the target relation is weaker.
Example: target has a weaker condition and is a permutation projection of its child relation
- query: Filter(condition: >($1, 20)) Scan(table: [hr, emps])
- target: Project(projects: [$1, $0, $2, $3, $4]) Filter(condition: >($1, 10)) Scan(table: [hr, emps])

Field Summary

Fields
Modifier and Type Field Description

static MaterializedViewSubstitutionVisitor.FilterToProjectUnifyRule1 INSTANCE
- Fields inherited from class org.apache.calcite.plan.SubstitutionVisitor.UnifyRule
  queryOperand, slotCount, targetOperand

Constructor Summary

Constructors
Modifier Constructor Description

private FilterToProjectUnifyRule1()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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.FilterToProjectUnifyRule1 INSTANCE
```
- Constructor Detail
  - FilterToProjectUnifyRule1
```
private FilterToProjectUnifyRule1()
```
- 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