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BUG: map_chunk wrong results when input is empty data #727

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What do these changes do?

Related issue number

Fixes #723

Check code requirements

  • tests added / passed (if needed)
  • Ensure all linting tests pass

@XprobeBot XprobeBot added the bug Something isn't working label Sep 28, 2023
@XprobeBot XprobeBot added this to the v0.7.0 milestone Sep 28, 2023
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codecov bot commented Sep 28, 2023

Codecov Report

Merging #727 (9cb4f26) into main (b320ca3) will decrease coverage by 12.01%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             main     #727       +/-   ##
===========================================
- Coverage   61.64%   49.64%   -12.01%     
===========================================
  Files        1058     1058               
  Lines       79780    79775        -5     
  Branches    16504    12431     -4073     
===========================================
- Hits        49181    39604     -9577     
- Misses      28045    38581    +10536     
+ Partials     2554     1590      -964     
Flag Coverage Δ
unittests 49.63% <0.00%> (-11.94%) ⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Coverage Δ
python/xorbits/_mars/dataframe/base/map_chunk.py 19.48% <0.00%> (-69.20%) ⬇️

... and 346 files with indirect coverage changes

@XprobeBot XprobeBot modified the milestones: v0.7.0, v0.7.1 Oct 23, 2023
@XprobeBot XprobeBot modified the milestones: v0.7.1, v0.7.2 Nov 21, 2023
@XprobeBot XprobeBot modified the milestones: v0.7.2, v0.7.3 Jan 5, 2024
@XprobeBot XprobeBot modified the milestones: v0.7.3, v0.7.4 Aug 22, 2024
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BUG: df.map_chunk with empty DataFrame cannot work
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