Package org.apache.calcite.rel.rules

Class FilterRemoveIsNotDistinctFromRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.FilterRemoveIsNotDistinctFromRule

public final class FilterRemoveIsNotDistinctFromRule
extends RelOptRule

Planner rule that replaces IS NOT DISTINCT FROM in a Filter with logically equivalent operations.

See Also:

SqlStdOperatorTable.IS_NOT_DISTINCT_FROM

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private class	FilterRemoveIsNotDistinctFromRule.RemoveIsNotDistinctFromRexShuttle	Shuttle that removes 'x IS NOT DISTINCT FROM y' and converts it to 'CASE WHEN x IS NULL THEN y IS NULL WHEN y IS NULL THEN x IS NULL ELSE x = y END'.

Field Summary

Fields

Modifier and Type	Field	Description
static FilterRemoveIsNotDistinctFromRule	INSTANCE	The singleton.

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Constructor	Description
FilterRemoveIsNotDistinctFromRule(RelBuilderFactory relBuilderFactory)	Creates a FilterRemoveIsNotDistinctFromRule.

Method Summary

Modifier and Type	Method	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, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final FilterRemoveIsNotDistinctFromRule INSTANCE

The singleton.

Constructor Detail

FilterRemoveIsNotDistinctFromRule

public FilterRemoveIsNotDistinctFromRule(RelBuilderFactory relBuilderFactory)

Creates a FilterRemoveIsNotDistinctFromRule.

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)