private void addResult(RexNode exp) { // Cast of literal can't be reduced, so skip those (otherwise we'd // go into an infinite loop as we add them back). if (exp.getKind() == RexKind.Cast) { RexCall cast = (RexCall) exp; RexNode operand = cast.getOperands()[0]; if (operand instanceof RexLiteral) { return; } } constExprs.add(exp); // In the case where the expression corresponds to a UDR argument, // we need to preserve casts. Note that this only applies to // the topmost argument, not expressions nested within the UDR // call. // // REVIEW zfong 6/13/08 - Are there other expressions where we // also need to preserve casts? if (parentCallTypeStack.isEmpty()) { addCasts.add(false); } else { addCasts.add( parentCallTypeStack.get(parentCallTypeStack.size() - 1) instanceof FarragoUserDefinedRoutine); } }