How to use

isDeterministic

method

in

org.h2.expression.JavaFunction

@Override
public Expression optimize(Session session) {
  boolean allConst = isDeterministic();
  for (int i = 0, len = args.length; i < len; i++) {
    Expression e = args[i].optimize(session);
    args[i] = e;
    allConst &= e.isConstant();
  }
  if (allConst) {
    return ValueExpression.get(getValue(session));
  }
  return this;
}

@Override
public boolean isEverything(ExpressionVisitor visitor) {
  switch (visitor.getType()) {
  case ExpressionVisitor.DETERMINISTIC:
    if (!isDeterministic()) {
      return false;
    }
    // only if all parameters are deterministic as well
    break;
  case ExpressionVisitor.GET_DEPENDENCIES:
    visitor.addDependency(functionAlias);
    break;
  default:
  }
  for (Expression e : args) {
    if (e != null && !e.isEverything(visitor)) {
      return false;
    }
  }
  return true;
}

@Override
public Expression optimize(Session session) {
  boolean allConst = isDeterministic();
  for (int i = 0, len = args.length; i < len; i++) {
    Expression e = args[i].optimize(session);
    args[i] = e;
    allConst &= e.isConstant();
  }
  if (allConst) {
    return ValueExpression.get(getValue(session));
  }
  return this;
}

@Override
public Expression optimize(Session session) {
  boolean allConst = isDeterministic();
  for (int i = 0, len = args.length; i < len; i++) {
    Expression e = args[i].optimize(session);
    args[i] = e;
    allConst &= e.isConstant();
  }
  if (allConst) {
    return ValueExpression.get(getValue(session));
  }
  return this;
}

@Override
public boolean isEverything(ExpressionVisitor visitor) {
  switch (visitor.getType()) {
  case ExpressionVisitor.DETERMINISTIC:
    if (!isDeterministic()) {
      return false;
    }
    // only if all parameters are deterministic as well
    break;
  case ExpressionVisitor.GET_DEPENDENCIES:
    visitor.addDependency(functionAlias);
    break;
  default:
  }
  for (Expression e : args) {
    if (e != null && !e.isEverything(visitor)) {
      return false;
    }
  }
  return true;
}

@Override
public boolean isEverything(ExpressionVisitor visitor) {
  switch (visitor.getType()) {
  case ExpressionVisitor.DETERMINISTIC:
    if (!isDeterministic()) {
      return false;
    }
    // only if all parameters are deterministic as well
    break;
  case ExpressionVisitor.GET_DEPENDENCIES:
    visitor.addDependency(functionAlias);
    break;
  default:
  }
  for (Expression e : args) {
    if (e != null && !e.isEverything(visitor)) {
      return false;
    }
  }
  return true;
}