org.apache.calcite.rel.stream

Class StreamRules.DeltaJoinTransposeRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.stream.StreamRules.DeltaJoinTransposeRule

Enclosing class:

StreamRules

public static class StreamRules.DeltaJoinTransposeRule
extends RelOptRule

Planner rule that pushes a Delta through a Join.

We apply something analogous to the product rule of differential calculus to implement the transpose:

stream(x join y) → x join stream(y) union all stream(x) join y

Field Summary

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Constructor and Description
DeltaJoinTransposeRule() Deprecated.
DeltaJoinTransposeRule(RelBuilderFactory relBuilderFactory) Creates a DeltaJoinTransposeRule.

Method Summary

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, convertOperand, 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

Constructor Detail

DeltaJoinTransposeRule

@Deprecated
public DeltaJoinTransposeRule()

Deprecated.

DeltaJoinTransposeRule

public DeltaJoinTransposeRule(RelBuilderFactory relBuilderFactory)

Creates a DeltaJoinTransposeRule.

Parameters:

relBuilderFactory - Builder for relational 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)