org.apache.calcite.rel.rules

Class ValuesReduceRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.ValuesReduceRule

public abstract class ValuesReduceRule
extends RelOptRule

Planner rule that folds projections and filters into an underlying LogicalValues.

Returns a simplified Values, perhaps containing zero tuples if all rows are filtered away.

For example,

select a - b from (values (1, 2), (3, 5), (7, 11)) as t (a, b) where a + b > 4

becomes

select x from (values (-2), (-4))

Field Summary

Fields

Modifier and Type	Field and Description
static ValuesReduceRule	FILTER_INSTANCE Instance of this rule that applies to the pattern Filter(Values).
static ValuesReduceRule	PROJECT_FILTER_INSTANCE Singleton instance of this rule that applies to the pattern Project(Filter(Values)).
static ValuesReduceRule	PROJECT_INSTANCE Instance of this rule that applies to the pattern Project(Values).

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

description, operands

Method Summary

Methods

Modifier and Type	Method and Description
protected void	apply(RelOptRuleCall call, LogicalProject project, LogicalFilter filter, LogicalValues values) Does the work.

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

any, convert, convert, convertList, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, onMatch, 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

FILTER_INSTANCE

public static final ValuesReduceRule FILTER_INSTANCE

Instance of this rule that applies to the pattern Filter(Values).

PROJECT_INSTANCE

public static final ValuesReduceRule PROJECT_INSTANCE

Instance of this rule that applies to the pattern Project(Values).

PROJECT_FILTER_INSTANCE

public static final ValuesReduceRule PROJECT_FILTER_INSTANCE

Singleton instance of this rule that applies to the pattern Project(Filter(Values)).

Method Detail

apply

protected void apply(RelOptRuleCall call,
         LogicalProject project,
         LogicalFilter filter,
         LogicalValues values)

Does the work.

Parameters:

call - Rule call

project - Project, may be null

filter - Filter, may be null

values - Values rel to be reduced