public static @NotNull ConstantResult fromDfType(@NotNull DfType dfType) {
      if (dfType == DfTypes.NULL) return NULL;
      if (dfType == DfTypes.TRUE) return TRUE;
      if (dfType == DfTypes.FALSE) return FALSE;
      if (dfType.isConst(0) || dfType.isConst(0L)) return ZERO;
      return UNKNOWN;
    }
public static @NotNull ConstantResult fromDfType(@NotNull DfType dfType)