Package org.apache.calcite.rel.rules

Class ProjectSetOpTransposeRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.ProjectSetOpTransposeRule

public class ProjectSetOpTransposeRule
extends RelOptRule

Planner rule that pushes a LogicalProject past a SetOp.

The children of the SetOp will project only the RexInputRefs referenced in the original LogicalProject.

Field Summary

Fields

Modifier and Type	Field	Description
static ProjectSetOpTransposeRule	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

Constructor	Description
ProjectSetOpTransposeRule(PushProjector.ExprCondition preserveExprCondition, RelBuilderFactory relBuilderFactory)	Creates a ProjectSetOpTransposeRule with an explicit condition whether to preserve expressions.

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 ProjectSetOpTransposeRule INSTANCE

preserveExprCondition

private PushProjector.ExprCondition preserveExprCondition

Expressions that should be preserved in the projection

Constructor Detail

ProjectSetOpTransposeRule

public ProjectSetOpTransposeRule(PushProjector.ExprCondition preserveExprCondition,
                                 RelBuilderFactory relBuilderFactory)

Creates a ProjectSetOpTransposeRule with an explicit condition whether to preserve expressions.

Parameters:

preserveExprCondition - Condition whether to preserve expressions

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)