Package org.apache.calcite.rel.rules

Class SortRemoveDuplicateKeysRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelRule<SortRemoveDuplicateKeysRule.Config>

org.apache.calcite.rel.rules.SortRemoveDuplicateKeysRule

All Implemented Interfaces:

TransformationRule

@Enclosing
public class SortRemoveDuplicateKeysRule
extends RelRule<SortRemoveDuplicateKeysRule.Config>
implements TransformationRule

Planner rule that remove duplicate sort keys.

The original SQL:

 SELECT d1 FROM (
   SELECT deptno AS d1, deptno AS d2 FROM dept
 ) AS tmp ORDER BY d1, d2
 

The original logical plan:

 LogicalProject(D1=[$0])
   LogicalSort(sort0=[$0], sort1=[$1], dir0=[ASC], dir1=[ASC])
     LogicalProject(D1=[$0], D2=[$0])
       LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
 

After optimization:

 LogicalProject(D1=[$0])
   LogicalProject(DEPTNO=[$0], DEPTNO0=[$0])
     LogicalSort(sort0=[$0], dir0=[ASC])
       LogicalProject(DEPTNO=[$0])
         LogicalTableScan(table=[[CATALOG, SALES, DEPT]])
 

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	SortRemoveDuplicateKeysRule.Config	Rule configuration.

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

RelRule.Done, RelRule.MatchHandler<R extends RelOptRule>, RelRule.OperandBuilder, RelRule.OperandDetailBuilder<R extends RelNode>, RelRule.OperandTransform

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

RelOptRule.ConverterRelOptRuleOperand

Field Summary

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

config

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	SortRemoveDuplicateKeysRule(SortRemoveDuplicateKeysRule.Config config)	Creates a SortRemoveDuplicateKeysRule.

Method Summary

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, 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

Constructor Details

SortRemoveDuplicateKeysRule

protected SortRemoveDuplicateKeysRule(SortRemoveDuplicateKeysRule.Config config)

Creates a SortRemoveDuplicateKeysRule.

Method Details

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>, org.apache.calcite.plan.RelHintsPropagator) to register the expression.

Specified by:

onMatch in class RelOptRule

Parameters:

call - Rule call

See Also:

• RelOptRule.matches(RelOptRuleCall)