Richard. As you are probably already aware, I forgot about the encoding column. An encoding (UTF8,UTF16,...) column would also needed for the PRAGMA function_list report to be the key for functions differing only by the encoding flag:
https://sqlite.org/c3ref/create_function.html One final issue. Using the key columns discussed so far, functions overriding builtin ones would appear in the PRAGMA report but subsequent builtin overrides and non-builtin overrides can only be reported as the most recent one. Perhaps it would be better to have a module name column instead of the existing builtin boolean column where the reserved module name, call it 'sqlite', designates builtin entries. Is {name, module, argcount, aggegate, encoding} a sufficient key to the function description when special case builtins have the suggested simulated entry(s)? Peter On Sat, Jan 13, 2018 at 12:15 PM, petern <peter.nichvolo...@gmail.com> wrote: > Single builtin functions that otherwise would have required two or more > separate create_function calls should have two or more corresponding > simulated entries for plain and aggregate flavors distinguishable by column > values. max(A) aggregate and max(A,B,...) function could look something > like this: > > name,builtin,aggregate,argcount > max,1,1,1 > max,1,0,-1 > > The arg_count column would simply be the nArg supplied (or as simulated) > to sqlite3_create_function(..,int nArg,..). That is -1 for any number and 0 > to 127 for specific quantity. In case of coalesce(), argcount would have to > be -1 but the description should say something about the minimum number of > arguments - case in point about the need for descriptions. > > Are there other possibilities which wouldn't have a key? > > Peter > > > On Fri, Jan 12, 2018 at 1:09 PM, Richard Hipp <d...@sqlite.org> wrote: > >> On 1/12/18, petern <peter.nichvolo...@gmail.com> wrote: >> > Is adding arg_count and >> > is_aggregate columns to PRAGMA function_list() on the roadmap? >> >> How would that work with functions like coalesce() and max() that take >> an arbitrary number of arguments, or like max() that is an aggregate >> with one argument and a scalar with two or more arguments? >> >> -- >> 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 >> > > _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
