Antoine Pitrou created ARROW-2347:
-------------------------------------
Summary: [Python] Multiple warnings with -Wconversion
Key: ARROW-2347
URL: https://issues.apache.org/jira/browse/ARROW-2347
Project: Apache Arrow
Issue Type: Bug
Reporter: Antoine Pitrou
There are multiple warnings when compiling the Cython-generated code with
{{-Wconversion}}:
{code}
/home/antoine/arrow/python/build/temp.linux-x86_64-3.6/lib.cxx: In function
'PyObject* __pyx_pf_7pyarrow_3lib_62union(PyObject*, PyObject*, PyObject*)':
/home/antoine/arrow/python/build/temp.linux-x86_64-3.6/lib.cxx:23850:45:
warning: conversion to 'std::vector<unsigned char>::value_type {aka unsigned
char}' from 'int' may alter its value [-Wconversion]
__pyx_v_type_codes.push_back(__pyx_v_i);
^
/home/antoine/arrow/python/build/temp.linux-x86_64-3.6/lib.cxx: In function
'PyObject*
__Pyx_PyInt_From_enum____arrow_3a__3a_Type_3a__3a_type(arrow::Type::type)':
/home/antoine/arrow/python/build/temp.linux-x86_64-3.6/lib.cxx:125758:70:
warning: the result of the conversion is unspecified because '-1' is outside
the range of type 'arrow::Type::type' [-Wconversion]
const enum arrow::Type::type neg_one = (enum arrow::Type::type) -1,
const_zero = (enum arrow::Type::type) 0;
^
/home/antoine/arrow/python/build/temp.linux-x86_64-3.6/lib.cxx: In function
'PyObject*
__Pyx_PyInt_From_enum____arrow_3a__3a_UnionMode_3a__3a_type(arrow::UnionMode::type)':
/home/antoine/arrow/python/build/temp.linux-x86_64-3.6/lib.cxx:125789:80:
warning: the result of the conversion is unspecified because '-1' is outside
the range of type 'arrow::UnionMode::type' [-Wconversion]
const enum arrow::UnionMode::type neg_one = (enum
arrow::UnionMode::type) -1, const_zero = (enum arrow::UnionMode::type) 0;
^
/home/antoine/arrow/python/build/temp.linux-x86_64-3.6/lib.cxx: In function
'PyObject*
__Pyx_PyInt_From_enum____arrow_3a__3a_TimeUnit_3a__3a_type(arrow::TimeUnit::type)':
/home/antoine/arrow/python/build/temp.linux-x86_64-3.6/lib.cxx:125820:78:
warning: the result of the conversion is unspecified because '-1' is outside
the range of type 'arrow::TimeUnit::type' [-Wconversion]
const enum arrow::TimeUnit::type neg_one = (enum arrow::TimeUnit::type)
-1, const_zero = (enum arrow::TimeUnit::type) 0;
^
{code}
(also similar warnings for _parquet.pyx due to Parquet enumerations)
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