[ARROW-14007] [C++] Fix compiler warnings in decimal promotion machinery

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 6.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/29607
• Assignee: David Li
• Reporter: David Li
• Created: 15/Sep/21 19:00
• Updated: 11/Jan/23 08:36
• Resolved: 16/Sep/21 16:22

Description

/home/lidavidm/Code/upstream/arrow-12671/cpp/src/arrow/result.h:452:30: warning: 'left_scaleup' may be used uninitialized in this function [-Wmaybe-uninitialized]
  452 |   auto&& result_name = (rexpr);                                                          \
      |                              ^
/home/lidavidm/Code/upstream/arrow-12671/cpp/src/arrow/compute/kernels/codegen_internal.cc:388:11: note: 'left_scaleup' was declared here
  388 |   int32_t left_scaleup, right_scaleup;
      |           ^~~~~~~~~~~~
In file included from /home/lidavidm/Code/upstream/arrow-12671/cpp/src/arrow/array/data.h:27,
                 from /home/lidavidm/Code/upstream/arrow-12671/cpp/src/arrow/array/array_base.h:26,
                 from /home/lidavidm/Code/upstream/arrow-12671/cpp/src/arrow/array/builder_binary.h:30,
                 from /home/lidavidm/Code/upstream/arrow-12671/cpp/src/arrow/compute/kernels/codegen_internal.h:27,
                 from /home/lidavidm/Code/upstream/arrow-12671/cpp/src/arrow/compute/kernels/codegen_internal.cc:18:
/home/lidavidm/Code/upstream/arrow-12671/cpp/src/arrow/result.h:452:30: warning: 'right_scaleup' may be used uninitialized in this function [-Wmaybe-uninitialized]
  452 |   auto&& result_name = (rexpr);                                                          \
      |                              ^
/home/lidavidm/Code/upstream/arrow-12671/cpp/src/arrow/compute/kernels/codegen_internal.cc:388:25: note: 'right_scaleup' was declared here
  388 |   int32_t left_scaleup, right_scaleup;

Issue Links

• links to: GitHub Pull Request #11170