org.apache.calcite.rel.rules

Class JoinProjectTransposeRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.JoinProjectTransposeRule

Direct Known Subclasses:

MultiJoinProjectTransposeRule

public class JoinProjectTransposeRule
extends RelOptRule

Planner rule that matches a Join one of whose inputs is a LogicalProject, and pulls the project up.

Projections are pulled up if the LogicalProject doesn't originate from a null generating input in an outer join.

Field Summary

Fields

Modifier and Type	Field and Description
static JoinProjectTransposeRule	BOTH_PROJECT
static JoinProjectTransposeRule	LEFT_PROJECT
static JoinProjectTransposeRule	RIGHT_PROJECT

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

description, operands

Constructor Summary

Constructors

Constructor and Description
JoinProjectTransposeRule(RelOptRuleOperand operand, String description)
JoinProjectTransposeRule(RelOptRuleOperand operand, String description, RelFactories.ProjectFactory pFactory)

Method Summary

Methods

Modifier and Type	Method and Description
protected RelNode	getProjectChild(RelOptRuleCall call, Project project, boolean leftChild) Returns the child of the project that will be used as input into the new LogicalJoin once the projects are pulled above the LogicalJoin.
protected Project	getRightChild(RelOptRuleCall call)
protected boolean	hasLeftChild(RelOptRuleCall call)
protected boolean	hasRightChild(RelOptRuleCall call)
void	onMatch(RelOptRuleCall call) Receives notification about a rule match.

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

any, convert, convert, convertList, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, some, toString, unordered

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

BOTH_PROJECT

public static final JoinProjectTransposeRule BOTH_PROJECT

LEFT_PROJECT

public static final JoinProjectTransposeRule LEFT_PROJECT

RIGHT_PROJECT

public static final JoinProjectTransposeRule RIGHT_PROJECT

Constructor Detail

JoinProjectTransposeRule

public JoinProjectTransposeRule(RelOptRuleOperand operand,
                        String description)

JoinProjectTransposeRule

public JoinProjectTransposeRule(RelOptRuleOperand operand,
                        String description,
                        RelFactories.ProjectFactory pFactory)

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)

hasLeftChild

protected boolean hasLeftChild(RelOptRuleCall call)

Parameters:

call - RelOptRuleCall

Returns:

true if the rule was invoked with a left project child

hasRightChild

protected boolean hasRightChild(RelOptRuleCall call)

Parameters:

call - RelOptRuleCall

Returns:

true if the rule was invoked with 2 children

getRightChild

protected Project getRightChild(RelOptRuleCall call)

Parameters:

call - RelOptRuleCall

Returns:

LogicalProject corresponding to the right child

getProjectChild

protected RelNode getProjectChild(RelOptRuleCall call,
                      Project project,
                      boolean leftChild)

Returns the child of the project that will be used as input into the new LogicalJoin once the projects are pulled above the LogicalJoin.

Parameters:

call - RelOptRuleCall

project - project RelNode

leftChild - true if the project corresponds to the left projection

Returns:

child of the project that will be used as input into the new LogicalJoin once the projects are pulled above the LogicalJoin