/**
* Gets the expression for an input and counts it.
*
* @param index Input ordinal
* @return Expression to which an input should be translated
*/
private Expression getInput(int index) {
Slot slot = inputSlots.get(index);
if (list == null) {
slot.count++;
} else {
if (slot.count > 1 && slot.parameterExpression == null) {
slot.parameterExpression = Expressions.parameter(slot.expression.type, "current" + index);
list.add(Expressions.declare(Modifier.FINAL, slot.parameterExpression, slot.expression));
}
}
return slot.parameterExpression != null ? slot.parameterExpression : slot.expression;
}
private Expression translate(RexNode expr) {
Slot slot = map.get(expr);
if (slot == null) {
Expression expression = translate0(expr);
assert expression != null;
final ParameterExpression parameter;
if (!inlineRexSet.contains(expr) && !(expr instanceof RexLocalRef)) {
parameter = Expressions.parameter(expression.getType(), "v" + map.size());
} else {
parameter = null;
}
slot = new Slot(parameter, expression);
if (parameter != null && list != null) {
list.add(Expressions.declare(Modifier.FINAL, slot.parameterExpression, slot.expression));
}
map.put(expr, slot);
}
slot.count++;
return slot.parameterExpression != null ? slot.parameterExpression : slot.expression;
}