net.sf.saffron.rex
Class RexUtil

java.lang.Object
  |
  +--net.sf.saffron.rex.RexUtil

public class RexUtil

extends Object

Utility methods concerning row-expressions.

Since:

Nov 23, 2003

Version:

$Id: $

Author:

jhyde

Field Summary

static RexNode[]

emptyExpressionArray

Constructor Summary

RexUtil()

Method Summary

static RexNode	clone(RexNode exp) Returns a copy of a row-expression.
static RexNode[]	clone(RexNode[] exps) Returns a copy of an array of row-expressions.
static RexNode[]	generateCastExpressions(RexBuilder rexBuilder, SaffronType lhsRowType, RexNode[] rhsExps)
static double	getSelectivity(RexNode exp)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

emptyExpressionArray

public static final RexNode[] emptyExpressionArray

Constructor Detail

RexUtil

public RexUtil()

Method Detail

getSelectivity

public static double getSelectivity(RexNode exp)

clone

public static RexNode clone(RexNode exp)

Returns a copy of a row-expression.

clone

public static RexNode[] clone(RexNode[] exps)

Returns a copy of an array of row-expressions.

generateCastExpressions

public static RexNode[] generateCastExpressions(RexBuilder rexBuilder,
                                                SaffronType lhsRowType,
                                                RexNode[] rhsExps)