org.apache.calcite.sql2rel

Class RelDecorrelator.RemoveSingleAggregateRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelRule<RelDecorrelator.RemoveSingleAggregateRule.RemoveSingleAggregateRuleConfig>

org.apache.calcite.sql2rel.RelDecorrelator.RemoveSingleAggregateRule

Enclosing class:

RelDecorrelator

public static final class RelDecorrelator.RemoveSingleAggregateRule
extends org.apache.calcite.plan.RelRule<RelDecorrelator.RemoveSingleAggregateRule.RemoveSingleAggregateRuleConfig>

Rule to remove an Aggregate with SINGLE_VALUE. For cases like:

Aggregate(SINGLE_VALUE) Project(single expression) Aggregate

For instance (subtree taken from TPCH query 17):

LogicalAggregate(group=[{}], agg#0=[SINGLE_VALUE($0)]) LogicalProject(EXPR$0=[*(0.2:DECIMAL(2, 1), $0)]) LogicalAggregate(group=[{}], agg#0=[AVG($0)]) LogicalProject(L_QUANTITY=[$4]) LogicalFilter(condition=[=($1, $cor0.P_PARTKEY)]) LogicalTableScan(table=[[TPCH_01, LINEITEM]])

Will be converted into:

LogicalProject($f0=[*(0.2:DECIMAL(2, 1), $0)]) LogicalAggregate(group=[{}], agg#0=[AVG($0)]) LogicalProject(L_QUANTITY=[$4]) LogicalFilter(condition=[=($1, $cor0.P_PARTKEY)]) LogicalTableScan(table=[[TPCH_01, LINEITEM]])

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	RelDecorrelator.RemoveSingleAggregateRule.RemoveSingleAggregateRuleConfig Rule configuration.

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

org.apache.calcite.plan.RelRule.Config, org.apache.calcite.plan.RelRule.Done, org.apache.calcite.plan.RelRule.MatchHandler<R extends org.apache.calcite.plan.RelOptRule>, org.apache.calcite.plan.RelRule.OperandBuilder, org.apache.calcite.plan.RelRule.OperandDetailBuilder<R extends org.apache.calcite.rel.RelNode>, org.apache.calcite.plan.RelRule.OperandTransform

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.RelRule

config

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

description, operands, relBuilderFactory

Method Summary

Modifier and Type	Method and Description
void	onMatch(org.apache.calcite.plan.RelOptRuleCall call)

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

Method Detail

onMatch

public void onMatch(org.apache.calcite.plan.RelOptRuleCall call)

Specified by:

onMatch in class org.apache.calcite.plan.RelOptRule