org.apache.calcite.rel.rules

Class FilterProjectTransposeRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.FilterProjectTransposeRule

public class FilterProjectTransposeRule
extends RelOptRule

Planner rule that pushes a LogicalFilter past a LogicalProject.

Field Summary

Fields

Modifier and Type	Field and Description
static FilterProjectTransposeRule	INSTANCE The default instance of FilterProjectTransposeRule.

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

description, operands

Constructor Summary

Constructors

Constructor and Description
FilterProjectTransposeRule(Class<? extends Filter> filterClass, RelFactories.FilterFactory filterFactory, Class<? extends Project> projectClass, RelFactories.ProjectFactory projectFactory) Creates a FilterProjectTransposeRule.

Method Summary

Methods

Modifier and Type	Method and Description
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

INSTANCE

public static final FilterProjectTransposeRule INSTANCE

The default instance of FilterProjectTransposeRule.

It matches any kind of join or filter, and generates the same kind of join and filter. It uses null values for filterFactory and projectFactory to achieve this.

Constructor Detail

FilterProjectTransposeRule

public FilterProjectTransposeRule(Class<? extends Filter> filterClass,
                          RelFactories.FilterFactory filterFactory,
                          Class<? extends Project> projectClass,
                          RelFactories.ProjectFactory projectFactory)

Creates a FilterProjectTransposeRule.

If filterFactory is null, creates the same kind of filter as matched in the rule. Similarly projectFactory.

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)