public class SemiJoinProjectTransposeRule extends RelOptRule
SemiJoin
down in a tree past
a Project
.
The intention is to trigger other rules that will convert
SemiJoin
s.
SemiJoin(LogicalProject(X), Y) → LogicalProject(SemiJoin(X, Y))
SemiJoinFilterTransposeRule
Modifier and Type | Field and Description |
---|---|
static SemiJoinProjectTransposeRule |
INSTANCE |
description, operands, relBuilderFactory
Modifier | Constructor and Description |
---|---|
private |
SemiJoinProjectTransposeRule(RelBuilderFactory relBuilderFactory)
Creates a SemiJoinProjectTransposeRule.
|
Modifier and Type | Method and Description |
---|---|
private RexNode |
adjustCondition(LogicalProject project,
LogicalJoin semiJoin)
Pulls the project above the semijoin and returns the resulting semijoin
condition.
|
void |
onMatch(RelOptRuleCall call)
Receives notification about a rule match.
|
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
public static final SemiJoinProjectTransposeRule INSTANCE
private SemiJoinProjectTransposeRule(RelBuilderFactory relBuilderFactory)
public void onMatch(RelOptRuleCall call)
RelOptRule
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.
onMatch
in class RelOptRule
call
- Rule callRelOptRule.matches(RelOptRuleCall)
private RexNode adjustCondition(LogicalProject project, LogicalJoin semiJoin)
project
- LogicalProject on the LHS of the semijoinsemiJoin
- the semijoinCopyright © 2012–2019 The Apache Software Foundation. All rights reserved.