org.apache.calcite.rel.rules

Class CalcSplitRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.CalcSplitRule

public class CalcSplitRule
extends RelOptRule

Planner rule that converts a Calc to a Project and Filter.

Not enabled by default, as it works against the usual flow, which is to convert Project and Filter to Calc. But useful for specific tasks, such as optimizing before calling an Interpreter.

Field Summary

Fields

Modifier and Type	Field and Description
static CalcSplitRule	INSTANCE

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Constructor and Description
CalcSplitRule(RelBuilderFactory relBuilderFactory) Creates a CalcSplitRule.

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

Field Detail

INSTANCE

public static final CalcSplitRule INSTANCE

Constructor Detail

CalcSplitRule

public CalcSplitRule(RelBuilderFactory relBuilderFactory)

Creates a CalcSplitRule.

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)