org.eigenbase.sql2rel
Class RelDecorrelator.RemoveSingleAggregateRule

java.lang.Object
  org.eigenbase.relopt.RelOptRule
      org.eigenbase.sql2rel.RelDecorrelator.RemoveSingleAggregateRule

Enclosing class:

RelDecorrelator

private final class RelDecorrelator.RemoveSingleAggregateRule
extends RelOptRule

Rule to remove single_value rel. For cases like

AggRel single_value proj/filter/agg/ join on unique LHS key AggRel single group

Field Summary

Fields inherited from class org.eigenbase.relopt.RelOptRule

ANY, description, operands

Constructor Summary

RelDecorrelator.RemoveSingleAggregateRule()

Method Summary

void	onMatch(RelOptRuleCall call) Receives notification about a rule match.

Methods inherited from class org.eigenbase.relopt.RelOptRule

convert, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, mergeTraitsAndConvert, mergeTraitsAndConvert, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

RelDecorrelator.RemoveSingleAggregateRule

public RelDecorrelator.RemoveSingleAggregateRule()

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.eigenbase.rel.RelNode) to register the expression.

Specified by:

onMatch in class RelOptRule

Parameters:

call - Rule call

See Also:

RelOptRule.matches(RelOptRuleCall)