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GH-43124: [C++] Initialize offset vector head as 0 after memory allocated in grouper.cc #43123

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GH-43124: [C++] Initialize offset vector head as 0 after memory allocated in grouper.cc #43123

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Commits on Nov 1, 2024

  1. init offset[0] as 0, avoid when num_groups == 0

    @flashzxi @zanmato1984
    flashzxi authored and zanmato1984 committed Nov 1, 2024
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  2. Update cpp/src/arrow/compute/row/grouper.cc

    @zanmato1984
    zanmato1984 committed Nov 1, 2024
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  3. Add test case to reproduce the issue

    @zanmato1984
    zanmato1984 committed Nov 1, 2024
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