Package org.apache.calcite.rel.rules
Class AggregateFilterTransposeRule
- java.lang.Object
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- org.apache.calcite.plan.RelOptRule
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- org.apache.calcite.rel.rules.AggregateFilterTransposeRule
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- Direct Known Subclasses:
DruidRules.DruidAggregateFilterTransposeRule
public class AggregateFilterTransposeRule extends RelOptRule
Planner rule that matches anAggregate
on aFilter
and transposes them, pushing the aggregate below the filter.In some cases, it is necessary to split the aggregate.
This rule does not directly improve performance. The aggregate will have to process more rows, to produce aggregated rows that will be thrown away. The rule might be beneficial if the predicate is very expensive to evaluate. The main use of the rule is to match a query that has a filter under an aggregate to an existing aggregate table.
- See Also:
FilterAggregateTransposeRule
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Field Summary
Fields Modifier and Type Field Description static AggregateFilterTransposeRule
INSTANCE
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Fields inherited from class org.apache.calcite.plan.RelOptRule
description, operands, relBuilderFactory
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Constructor Summary
Constructors Modifier Constructor Description private
AggregateFilterTransposeRule()
AggregateFilterTransposeRule(RelOptRuleOperand operand, RelBuilderFactory relBuilderFactory)
Creates an AggregateFilterTransposeRule.
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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
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Field Detail
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INSTANCE
public static final AggregateFilterTransposeRule INSTANCE
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Constructor Detail
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AggregateFilterTransposeRule
private AggregateFilterTransposeRule()
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AggregateFilterTransposeRule
public AggregateFilterTransposeRule(RelOptRuleOperand operand, RelBuilderFactory relBuilderFactory)
Creates an AggregateFilterTransposeRule.
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Method Detail
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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 classRelOptRule
- Parameters:
call
- Rule call- See Also:
RelOptRule.matches(RelOptRuleCall)
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