net.sf.farrago.namespace.ftrs
Class FtrsScanToSearchRule

java.lang.Object
  org.eigenbase.relopt.RelOptRule
      net.sf.farrago.namespace.ftrs.FtrsScanToSearchRule

 class FtrsScanToSearchRule
extends RelOptRule

FtrsScanToSearchRule is a rule for converting FilterRel+FtrsIndexScanRel into FtrsIndexSearchRel (when the filter has the appropriate form).

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/namespace/ftrs/FtrsScanToSearchRule.java#35 $

Author:

John V. Sichi

Field Summary

static FtrsScanToSearchRule

instance

Fields inherited from class org.eigenbase.relopt.RelOptRule

ANY, description, operands

Constructor Summary

private

FtrsScanToSearchRule() Creates a FtrsScanToSearchRule.

Method Summary

private void	considerIndex(FemLocalIndex index, FtrsIndexScanRel origScan, FemAbstractColumn filterColumn, SargExpr sargExpr, RelOptRuleCall call, RexNode extraFilter)
CallingConvention	getOutConvention() Returns the calling convention of the result of firing this rule, null if not known.
void	onMatch(RelOptRuleCall call) Receives notification about a rule match.
(package private) static boolean	testIndexColumn(FemLocalIndex index, CwmColumn column)
private void	transformCall(RelOptRuleCall call, RelNode searchRel, RexNode extraFilter)

Methods inherited from class org.eigenbase.relopt.RelOptRule

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

Methods inherited from class java.lang.Object

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

Field Detail

instance

public static final FtrsScanToSearchRule instance

Constructor Detail

FtrsScanToSearchRule

private FtrsScanToSearchRule()

Creates a FtrsScanToSearchRule.

Method Detail

getOutConvention

public CallingConvention getOutConvention()

Description copied from class: RelOptRule

Returns the calling convention of the result of firing this rule, null if not known.

Overrides:

getOutConvention in class RelOptRule

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)

testIndexColumn

static boolean testIndexColumn(FemLocalIndex index,
                               CwmColumn column)

considerIndex

private void considerIndex(FemLocalIndex index,
                           FtrsIndexScanRel origScan,
                           FemAbstractColumn filterColumn,
                           SargExpr sargExpr,
                           RelOptRuleCall call,
                           RexNode extraFilter)

transformCall

private void transformCall(RelOptRuleCall call,
                           RelNode searchRel,
                           RexNode extraFilter)