On Sat, 2009-01-17 at 02:09 -0500, Faheem Mitha wrote: > Hi, > > Can anyone comment on the practicality of using the code for array_agg > from the dev repos, file src/backend/utils/adt/array_userfuncs.c in 8.3 as > a user defined function? It looks like this code was recently added, Nov > 13th/14th. There are two functions, array_agg_transfn and > array_agg_finalfn, but I'm not clear how to use them. The idea would be to > compile and load them like as any other user-defined C function in 8.3. I > was informed that directly trying to use these functions in 8.3 would not > work. I realise this funcionality will be available in 8.4, but I don't > want to wait. > > If anyone has working code along these lines, please send it to me. Also, > please CC me on any reply. Thanks. Hi, I wrote a module that will include these functions in 8.3. The reason it's not easy to just make them a normal UDF is because the state type is "internal", and that's not allowed using regular SQL. I got around this by updating the catalogs directly. I believe "internal" is safe here because the state still uses one palloc() chunk (and it matches the commit to 8.4, anyway). Code review welcome. Regards, Jeff Davis
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