I'm looking at how NULLs are handled in relation to plpgsql row types.
Looking at exec_assign_value, it appears that we're supposed to be able
to handle setting a row variable to NULL:
if (*isNull) { /* If source is null, just assign nulls to the row */
exec_move_row(estate, NULL, row, NULL, NULL); }
However, the test right above that means that we'll fail if the user
tries something like "row_variable := NULL;":
if (!(valtype == RECORDOID || get_typtype(valtype) == 'c'))
ereport(ERROR, (errcode(ERRCODE_DATATYPE_MISMATCH), errmsg("cannot
assignnon-composite value to a row variable")));
Presumably, I can just add code to that test to allow for *isNull.
Of course, setting a row variable to null is a lot more useful if we can
actually test for it after the fact, and I'm not really sure how to make
that happen.
--
Jim Nasby jim@nasby.net
EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)
