In PLySequence_ToArray_recurse(), there's this check:
if (PySequence_Length(list) != dims[dim])
ereport(ERROR,
(errmsg("wrong length of inner sequence: has length
%d, but %d was expected",
(int) PySequence_Length(list),
dims[dim]),
(errdetail("To construct a multidimensional array,
the inner sequences must all have the same length."))));
It's missing an error code, making it implicitly ERRCODE_INTERNAL_ERROR,
which is surely not right. That's simple to fix, but what error code
should we use?
I'm inclined to use ERRCODE_ARRAY_SUBSCRIPT_ERROR, because that's used
in the similar error message with SQL ARRAY expression, like "ARRAY[[1],
[2, 3]]". Most checks when converting between SQL and Python types use
the PLy_elog() function, which uses the genericc
ERRCODE_EXTERNAL_ROUTINE_EXCEPTION error code, but I think
ERRCODE_ARRAY_SUBSCRIPT_ERROR is better.
You get this error e.g. if you try to return a python lists of lists
from a PL/python function as a multi-dimensional array, but the sublists
have different lengths:
create function return_array() returns int[] as $$
return [[1], [1,2]]
$$ language plpythonu;
postgres=# select return_array();
ERROR: wrong length of inner sequence: has length 2, but 1 was expected
DETAIL: To construct a multidimensional array, the inner sequences must
all have the same length.
CONTEXT: while creating return value
PL/Python function "return_array"
Thoughts? If not, I'm going to add
errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR) to that.
- Heikki
