pitrou commented on a change in pull request #12348:
URL: https://github.com/apache/arrow/pull/12348#discussion_r800901189



##########
File path: cpp/src/arrow/python/python_to_arrow.cc
##########
@@ -416,8 +416,18 @@ class PyValue {
     }
     RETURN_NOT_OK(PopulateMonthDayNano<MonthDayNanoField::kNanoseconds>::Field(
         obj, &output.nanoseconds, &found_attrs));
-
     if (ARROW_PREDICT_FALSE(!found_attrs) && !is_date_offset) {
+      if (PyTuple_Check(obj) && PyTuple_Size(obj) == 3) {
+        RETURN_NOT_OK(internal::CIntFromPython(PyTuple_GET_ITEM(obj, 0), 
&output.months,
+                                               "Months (Index 0) index to 
large"));
+        RETURN_NOT_OK(internal::CIntFromPython(PyTuple_GET_ITEM(obj, 1), 
&output.days,
+                                               "Days (Index 1) index to 
large"));
+        RETURN_NOT_OK(internal::CIntFromPython(PyTuple_GET_ITEM(obj, 2),
+                                               &output.nanoseconds,
+                                               "Nanoseconds (Index 2) index to 
large"));
+        return output;
+      }
+
       // date_offset can have zero fields.

Review comment:
       Move this comment before the enclosing `if`?

##########
File path: cpp/src/arrow/python/python_to_arrow.cc
##########
@@ -416,8 +416,18 @@ class PyValue {
     }
     RETURN_NOT_OK(PopulateMonthDayNano<MonthDayNanoField::kNanoseconds>::Field(
         obj, &output.nanoseconds, &found_attrs));
-
     if (ARROW_PREDICT_FALSE(!found_attrs) && !is_date_offset) {
+      if (PyTuple_Check(obj) && PyTuple_Size(obj) == 3) {
+        RETURN_NOT_OK(internal::CIntFromPython(PyTuple_GET_ITEM(obj, 0), 
&output.months,
+                                               "Months (Index 0) index to 
large"));
+        RETURN_NOT_OK(internal::CIntFromPython(PyTuple_GET_ITEM(obj, 1), 
&output.days,
+                                               "Days (Index 1) index to 
large"));
+        RETURN_NOT_OK(internal::CIntFromPython(PyTuple_GET_ITEM(obj, 2),
+                                               &output.nanoseconds,
+                                               "Nanoseconds (Index 2) index to 
large"));

Review comment:
       Wording suggestion:
   ```suggestion
           RETURN_NOT_OK(internal::CIntFromPython(PyTuple_GET_ITEM(obj, 0), 
&output.months,
                                                  "Months (tuple item #0) too 
large"));
           RETURN_NOT_OK(internal::CIntFromPython(PyTuple_GET_ITEM(obj, 1), 
&output.days,
                                                  "Days (tuple item #1) too 
large"));
           RETURN_NOT_OK(internal::CIntFromPython(PyTuple_GET_ITEM(obj, 2),
                                                  &output.nanoseconds,
                                                  "Nanoseconds (tuple item #2) 
too large"));
   ```




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