// implement CallConvertlet
public void convert(RexCall call) {
// REVIEW jvs 18-Mar-2006: The test for variableSeen
// here and elsewhere precludes predicates like where
// (boolean_col AND (int_col > 10)). Should probably
// support bare boolean columns as predicates with
// coordinate TRUE.
if (variableSeen || (coordinate != null)) {
failed = true;
}
if (failed) {
return;
}
int nOperands = call.getOperands().size();
assert (exprStack.size() >= nOperands);
SargSetExpr expr = factory.newSetExpr(boundInputRef.getType(), setOp);
// Pop the correct number of operands off the stack
// and transfer them to the new set expression.
ListIterator<SargExpr> iter = exprStack.listIterator(exprStack.size() - nOperands);
while (iter.hasNext()) {
expr.addChild(iter.next());
iter.remove();
}
exprStack.add(expr);
}
/** Reconstructs a rex predicate from a list of SargExprs which will be AND'ed together. */
private void recomposeConjunction() {
for (int i = 0; i < sargBindingList.size(); i++) {
final SargBinding currBinding = sargBindingList.get(i);
final RexInputRef currRef = currBinding.getInputRef();
SargExpr currSargExpr = currBinding.getExpr();
RexNode currAndNode = sarg2RexMap.get(currSargExpr);
// don't need this anymore
// will be have new mapping put back if currSargExpr remain
// unchanged.
sarg2RexMap.remove(currSargExpr);
boolean recomp = false;
// search the rest of the list to find SargExpr on the same col.
ListIterator<SargBinding> iter = sargBindingList.listIterator(i + 1);
while (iter.hasNext()) {
final SargBinding nextBinding = iter.next();
final RexInputRef nextRef = nextBinding.getInputRef();
final SargExpr nextSargExpr = nextBinding.getExpr();
if (nextRef.getIndex() == currRef.getIndex()) {
// build new SargExpr
SargSetExpr expr =
factory.newSetExpr(currSargExpr.getDataType(), SargSetOperator.INTERSECTION);
expr.addChild(currSargExpr);
expr.addChild(nextSargExpr);
// build new RexNode
currAndNode =
factory
.getRexBuilder()
.makeCall(
SqlStdOperatorTable.andOperator, currAndNode, sarg2RexMap.get(nextSargExpr));
currSargExpr = expr;
sarg2RexMap.remove(nextSargExpr);
iter.remove();
recomp = true;
}
}
if (recomp) {
assert !simpleMode;
if (!testDynamicParamSupport(currSargExpr)) {
// Oops, we can't actually support the conjunction we
// recomposed. Toss it. (We could do a better job by at
// least using part of it, but the effort might be better
// spent on implementing deferred expression evaluation.)
nonSargFilterList.add(currAndNode);
sargBindingList.remove(i);
continue;
}
}
if (recomp) {
SargBinding newBinding = new SargBinding(currSargExpr, currRef);
sargBindingList.remove(i);
sargBindingList.add(i, newBinding);
}
sarg2RexMap.put(currSargExpr, currAndNode);
}
}
private void intersectSequences(SargIntervalSequence targetSeq, SargIntervalSequence sourceSeq) {
ListIterator<SargInterval> targetIter = targetSeq.list.listIterator();
if (!targetIter.hasNext()) {
// No target intervals at all, so quit.
return;
}
ListIterator<SargInterval> sourceIter = sourceSeq.list.listIterator();
if (!sourceIter.hasNext()) {
// No source intervals at all, so result is empty
targetSeq.list.clear();
return;
}
// Start working on first source and target intervals
SargInterval target = targetIter.next();
SargInterval source = sourceIter.next();
// loop invariant: both source and target are non-null on entry
for (; ; ) {
if (source.getUpperBound().compareTo(target.getLowerBound()) < 0) {
// Source is completely below target; discard it and
// move on to next one.
if (!sourceIter.hasNext()) {
// No more sources.
break;
}
source = sourceIter.next();
continue;
}
if (target.getUpperBound().compareTo(source.getLowerBound()) < 0) {
// Target is completely below source; discard it and
// move on to next one.
targetIter.remove();
if (!targetIter.hasNext()) {
// All done.
return;
}
target = targetIter.next();
continue;
}
// Overlap case: perform intersection of the two intervals.
if (source.getLowerBound().compareTo(target.getLowerBound()) > 0) {
// Source starts after target starts, so trim the target.
target.setLower(
source.getLowerBound().getCoordinate(), source.getLowerBound().getStrictness());
}
int c = source.getUpperBound().compareTo(target.getUpperBound());
if (c < 0) {
// The source ends before the target ends, so split the target
// into two parts. The first part will be kept for sure; the
// second part will be compared against further source ranges.
SargInterval newTarget = new SargInterval(factory, dataType);
newTarget.setLower(
source.getUpperBound().getCoordinate(),
source.getUpperBound().getStrictnessComplement());
if (target.getUpperBound().isFinite()) {
newTarget.setUpper(
target.getUpperBound().getCoordinate(), target.getUpperBound().getStrictness());
}
// Trim current target to exclude the part of the range
// which will move to newTarget.
target.setUpper(
source.getUpperBound().getCoordinate(), source.getUpperBound().getStrictness());
// Insert newTarget after target. This makes newTarget
// into previous().
targetIter.add(newTarget);
// Next time through, work on newTarget.
// targetIter.previous() is pointing at the newTarget.
target = targetIter.previous();
// Now targetIter.next() is also pointing at the newTarget;
// need to do this redundant step to get targetIter in sync
// with target.
target = targetIter.next();
// Advance source.
if (!sourceIter.hasNext()) {
break;
}
source = sourceIter.next();
} else if (c == 0) {
// Source and target ends coincide, so advance both source and
// target.
if (!targetIter.hasNext()) {
return;
}
target = targetIter.next();
if (!sourceIter.hasNext()) {
break;
}
source = sourceIter.next();
} else {
// Source ends after target ends, so advance target.
assert (c > 0);
if (!targetIter.hasNext()) {
return;
}
target = targetIter.next();
}
}
// Discard any remaining targets since they didn't have corresponding
// sources.
for (; ; ) {
targetIter.remove();
if (!targetIter.hasNext()) {
break;
}
targetIter.next();
}
}