Package org.apache.calcite.rel.rules

Class ProjectFilterTransposeRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.ProjectFilterTransposeRule

Direct Known Subclasses:

DruidRules.DruidProjectFilterTransposeRule

public class ProjectFilterTransposeRule
extends RelOptRule

Planner rule that pushes a Project past a Filter.

Field Summary

Fields

Modifier and Type	Field	Description
static ProjectFilterTransposeRule	INSTANCE
private PushProjector.ExprCondition	preserveExprCondition	Expressions that should be preserved in the projection

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Modifier	Constructor	Description
	ProjectFilterTransposeRule(java.lang.Class<? extends Project> projectClass, java.lang.Class<? extends Filter> filterClass, RelBuilderFactory relBuilderFactory, PushProjector.ExprCondition preserveExprCondition)	Creates a ProjectFilterTransposeRule.
protected	ProjectFilterTransposeRule(RelOptRuleOperand operand, PushProjector.ExprCondition preserveExprCondition, RelBuilderFactory relBuilderFactory)

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, 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 ProjectFilterTransposeRule INSTANCE

preserveExprCondition

private final PushProjector.ExprCondition preserveExprCondition

Expressions that should be preserved in the projection

Constructor Detail

ProjectFilterTransposeRule

public ProjectFilterTransposeRule(java.lang.Class<? extends Project> projectClass,
                                  java.lang.Class<? extends Filter> filterClass,
                                  RelBuilderFactory relBuilderFactory,
                                  PushProjector.ExprCondition preserveExprCondition)

Creates a ProjectFilterTransposeRule.

Parameters:

preserveExprCondition - Condition for expressions that should be preserved in the projection

ProjectFilterTransposeRule

protected ProjectFilterTransposeRule(RelOptRuleOperand operand,
                                     PushProjector.ExprCondition preserveExprCondition,
                                     RelBuilderFactory relBuilderFactory)

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)