Examples are usually stored in leaves, but functions without arguments (NOW, ROW) are not currently treated as leaves even though they are, in fact, leaves.
The formulas without arguments can be assigned as discrete token (like in FormulaToken.java), so for the time being they can be treated as non operation node as a leaf.
Examples are usually stored in leaves, but functions without arguments (NOW, ROW) are not currently treated as leaves even though they are, in fact, leaves.