On 2/27/19, Jean-Baptiste Gardette <jb.garde...@orens.fr> wrote:
> have you any explanation why the typof() output of
> "SELECT DerefDict_SQL('A'), typeof(DerefDict_SQL('A'))"
> gives "text" in Sequence A and "real" in Sequence B ?
>No. The code that determines the return type of a TCL UDF is here: https://www.sqlite.org/src/artifact/6b19e7562195aaf8?ln=993-1018 As you can see, the interface is looking at the Tcl_Obj.typePtr value to try to guess an appropriate return type. This is considered bad form in TCL since TCL makes no guarantees about the value of typePtr for a Tcl_Obj. But the technique has worked well for nearly two decades. What if we were to add a new option to the "db function" method of the TCL interface that let you specify the return type of the TCL-implemented UDF? If the optional argument is omitted, then the current behavior of trying to guess the return type based on typePtr is used. But if the "-returntype TYPE" argument is present, it determines which return type to use regardless of the value in the typePtr. Would that help your situation? Note that my tests were run after compiling both TCL and SQLite from sources. There is no telling what non-standard changes may have been added by people who assembled your pre-compiled binaries. -- D. Richard Hipp d...@sqlite.org _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
