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BUG: to_json failing on PyPy #40525

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Merged
merged 9 commits into from
Mar 23, 2021
Merged

BUG: to_json failing on PyPy #40525

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197a2f1
WIP
mzeitlin11 Mar 19, 2021
b1f4bcc
BUG: to_json failing on PyPy
mzeitlin11 Mar 19, 2021
fc59ec4
Update doc/source/whatsnew/v1.2.4.rst
mzeitlin11 Mar 20, 2021
16d13d0
Merge remote-tracking branch 'origin/master' into bug/is_mixed_type
mzeitlin11 Mar 21, 2021
0900f23
Merge branch 'bug/is_mixed_type' of github.com:/mzeitlin11/pandas int…
mzeitlin11 Mar 21, 2021
f606811
Merge remote-tracking branch 'origin/master' into bug/is_mixed_type
mzeitlin11 Mar 22, 2021
6582051
Reorder functions to remove forward dec
mzeitlin11 Mar 22, 2021
51f37e0
Add simple extension array tests
mzeitlin11 Mar 23, 2021
9af4785
Revert test addition
mzeitlin11 Mar 23, 2021
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v1.2.4.rst
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Expand Up @@ -16,6 +16,7 @@ Fixed regressions
~~~~~~~~~~~~~~~~~

- Fixed regression in :meth:`DataFrame.sum` when ``min_count`` greater than the :class:`DataFrame` shape was passed resulted in a ``ValueError`` (:issue:`39738`)
- Fixed regression in :func:`pandas.to_json` raising ``AttributeError`` when run on PyPy (:issue:`39837`)
-

.. ---------------------------------------------------------------------------
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10 changes: 5 additions & 5 deletions pandas/_libs/src/ujson/python/objToJSON.c
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Expand Up @@ -144,6 +144,7 @@ typedef struct __PyObjectEncoder {
enum PANDAS_FORMAT { SPLIT, RECORDS, INDEX, COLUMNS, VALUES };

int PdBlock_iterNext(JSOBJ, JSONTypeContext *);
static Py_ssize_t get_attr_length(PyObject *obj, char *attr);
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Rather than forward declaring this can you just swap the position the of get_attr_length and is_simple_frame functions?

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Will make that change


void *initObjToJSON(void) {
PyObject *mod_pandas;
Expand Down Expand Up @@ -273,14 +274,13 @@ static PyObject *get_sub_attr(PyObject *obj, char *attr, char *subAttr) {
}

static int is_simple_frame(PyObject *obj) {
PyObject *check = get_sub_attr(obj, "_mgr", "is_mixed_type");
int ret = (check == Py_False);

if (!check) {
PyObject *mgr = PyObject_GetAttrString(obj, "_mgr");
if (!mgr) {
return 0;
}
int ret = (get_attr_length(mgr, "blocks") <= 1);
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Hmm I'm not really sure about this change. The problem with how this code is currently set up is that when is_simple_frame is True then we will just serialize whatever .values is for that DataFrame. However, the rules for extension arrays are a bit different.

Do we have test coverage for DataFrames that only contain 1 block of an extension array? If not I'd be worried this could change things that we aren't testing currently

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My motivation here was to replace the is_mixed_type property the same way it was handled in #40525 (so theoretically this should revert behavior to pre #40525).

Will look into your question and see if that case is covered

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Didn't see any coverage, have added some simple tests for the one ExtensionBlock case (which match 1.1.5 behavior). Let me know if this is what you had in mind!


Py_DECREF(check);
Py_DECREF(mgr);
return ret;
}

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