AggregateRemoveRule (Apache Calcite API)

java.lang.Object
- org.apache.calcite.plan.RelOptRule
- - org.apache.calcite.rel.rules.AggregateRemoveRule

```
public class AggregateRemoveRule
extends RelOptRule
```
Planner rule that removes a Aggregate if it computes no aggregate functions (that is, it is implementing SELECT DISTINCT) and the underlying relational expression is already distinct.

Field Summary

Fields
Modifier and Type Field Description

static AggregateRemoveRule INSTANCE
- Fields inherited from class org.apache.calcite.plan.RelOptRule
  description, operands, relBuilderFactory

Constructor Summary

Constructors
Constructor	Description
`AggregateRemoveRule(java.lang.Class<? extends Aggregate> aggregateClass)`	Deprecated.
`AggregateRemoveRule(java.lang.Class<? extends Aggregate> aggregateClass, RelBuilderFactory relBuilderFactory)`	Creates an AggregateRemoveRule.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

void onMatch(RelOptRuleCall call)
Receives notification about a rule match.
- 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 Detail
  - INSTANCE
```
public static final AggregateRemoveRule INSTANCE
```
- Constructor Detail
  - AggregateRemoveRule
```
@Deprecated
public AggregateRemoveRule(java.lang.Class<? extends Aggregate> aggregateClass)
```
    Deprecated.
  - AggregateRemoveRule
```
public AggregateRemoveRule(java.lang.Class<? extends Aggregate> aggregateClass,
                           RelBuilderFactory relBuilderFactory)
```
    Creates an AggregateRemoveRule.
- Method Detail
  - onMatch
```
public void onMatch(RelOptRuleCall call)
```
    Description copied from class: RelOptRule
    
    Receives notification about a rule match. At the time that this method is called, call.rels holds the set of relational expressions which match the operands to the rule; call.rels[0] is the root expression.
    Typically a rule would check that the nodes are valid matches, creates a new expression, then calls back RelOptRuleCall.transformTo(org.apache.calcite.rel.RelNode, java.util.Map<org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelNode>) to register the expression.
    
    Specified by:
    
    onMatch in class RelOptRule
    
    Parameters:
    
    call - Rule call
    
    See Also:
    
    RelOptRule.matches(RelOptRuleCall)