@Override
public void visit(Function function) {
boolean recognized = isRecognized(function);
if (!recognized) {
// try to extract SUM
// parameters for COUNT are ignored, as explained in super
final String fnName = function.getName();
if (fnName.equalsIgnoreCase("SUM")) {
recognized = isRecognized(function.getParameters());
if (recognized) {
final ValueExpression expr = popFromExprStack();
createSum(expr, function.isDistinct());
}
} else if (fnName.equalsIgnoreCase("COUNT")) {
final List<ValueExpression> expressions = new ArrayList<ValueExpression>();
if (function.isDistinct()) {
// putting something on stack only if isDistinct is set to
// true
recognized = isRecognized(function.getParameters());
// it might happen that we put on stack something we don't
// use
// this is the case only when some exprs are recognized and
// the others not
if (recognized) {
// create a list of expressions
int numParams = 0;
final ExpressionList params = function.getParameters();
if (params != null) numParams = params.getExpressions().size();
for (int i = 0; i < numParams; i++) expressions.add(popFromExprStack());
}
} else recognized = true;
if (recognized)
// finally, create CountAgg out of expressions (empty if
// nonDistinct)
createCount(expressions, function.isDistinct());
}
}
if (!recognized)
// normal call to parent
super.visit(function);
}
@Override
public void visit(Addition adtn) {
if (!isRecognized(adtn))
// normal call to parent
super.visit(adtn);
}
@Override
public void visit(Subtraction s) {
if (!isRecognized(s))
// normal call to parent
super.visit(s);
}
@Override
public void visit(Parenthesis prnths) {
if (!isRecognized(prnths))
// normal call to parent
super.visit(prnths);
}
@Override
public void visit(Multiplication m) {
if (!isRecognized(m))
// normal call to parent
super.visit(m);
}
@Override
public void visit(Division dvsn) {
if (!isRecognized(dvsn))
// normal call to parent
super.visit(dvsn);
}